build: Use git submodules for Fuel git repos

This change reworks support for cloning (fetching) and patching all
Fuel components (fuel-library ... fuel-ui, see [1] for full list),
both outside the ISO build process (for development purposes, like
testing OPNFV patches apply cleanly to each component), and during
the ISO build.

The implementation relies heavily on git submodules and patches,
so backporting pending upstream gerrit changes, as well as adding new
out-of-upstream-tree patches, should be trivial.

Also, since without tracking remotes the repos rarely change, leverage
the in-place OPNFV build caching mechanism to drastically reduce the
number of git clones during each build.

The mechanism is detailed more in-depth in the JIRA ticket [3], and
it's merely a rehash of the submodule handling in Armband, implemented
initially by Stanislaw Kardach <stanislaw.kardach@cavium.com>.

Pros (+ new features):
 - OPNFV patches for Fuel components can be applied (imported) or
   developed (exported) outside of the ISO build process;
 - git repo caching reduces the number of external pulls;
 - reuse the same fuel-* componets in ALL targets
   e.g. fuel-mirror used to employ 2 slightly different git trees;
 - one step closer to Fuel/Armband merge (lots of steps left though);

Cons:
 - adds a lot complexity to solve a non-problem (handling the repos
   is fine in the current form, for the current goals);
   However, patching <fuel-astute> or <fuel-agent> seems to be
   quite complicated with the current mechanism, as env vars
   override our locally patched repos for these components).
   The proposed change should eliminate this issue completely.

CHANGE:
 Aligned divergent fuel-mirror in ISO vs local repo build by
 applying the 302 redirect fix ("Fixed handling http redirects") [2]
 on top of 9.0.1 tag in fuel-mirror repo, and using that for both.
 This obsoleted the followking mk file:
 - build/f_isoroot/f_repobuild/config.mk

CHANGE:
 Removed unused make target `get-fuel-repo` from build/config.mk.

FIXME:
 Remote tracking is currently deactivated for all branches.
 Change this when remote HEAD should be tracked instead,
 e.g. during Newton rebase.

[1] https://github.com/openstack/fuel-main/blob/stable/mitaka/repos.mk#L32
[2] https://review.openstack.org/#/c/334882/
[3] https://jira.opnfv.org/browse/FUEL-200

TODO: Extend build/f_repos/README.md with info about:
 - branch changes;
 - tag bumps;
 - patching now supports subdirs;

v5 -> v6:
 * Added support for nesting patches in subdirs, to be used for feature
   groups and related changes across submodules.
   E.g. Upcoming multiarch EFI support could go in:
    - .../f_repos/patch/fuel-agent/multiarch-efi/...;
    - .../f_repos/patch/fuel-astute/multiarch-efi/...;
   While Armband patches could go in:
    - .../f_repos/patch/fuel-agent/armband/...;
    - .../f_repos/patch/fuel-astute/armband/...;
   etc.
v6 -> v13:
 * fix wrong tag used for VERSION dump;
 * fix wrong tag used for patches-export;
 * move OPNFV_TAG to main config.mk and use it in FUEL_*_COMMIT;
 * only run `patches-import` when patches changed / not yet applied;
 * only run `clean` for stale `.cacheid` (avoid re-applying patches);
 * allow git submodule path/name to be different (FIXED);
 * put-cache should only run when artifact is not already cached;
 * `git am`: use 3-way merge so already applied patches are gently
   skipped (useful for upstreaming patches from Armband);
 * Properly support nested patch dirs;
 * Colorize the output a little;

JIRA: FUEL-200

Change-Id: I9dbdd9b3022896d4497d21be8dacc859730db489
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

14 files changed, 0 insertions, 0 deletions

diff --git a/build/f_repos/sub/fuel-agent b/build/f_repos/sub/fuel-agent
new file mode 160000
+Subproject 7ffbf39caf5845bd82b8ce20a7766cf24aa803f
diff --git a/build/f_repos/sub/fuel-astute b/build/f_repos/sub/fuel-astute
new file mode 160000
+Subproject 390b257240d49cc5e94ed5c4fcd940b5f2f6ec6
diff --git a/build/f_repos/sub/fuel-library b/build/f_repos/sub/fuel-library
new file mode 160000
+Subproject e283b62750d9e26355981b3ad3be7c880944ae0
diff --git a/build/f_repos/sub/fuel-main b/build/f_repos/sub/fuel-main
new file mode 160000
+Subproject d6a22557d132c592b18c6bac90f5f4b8d1aa3ad
diff --git a/build/f_repos/sub/fuel-menu b/build/f_repos/sub/fuel-menu
new file mode 160000
+Subproject 0ed9e206ed1c6271121d3acf52a6bf757411286
diff --git a/build/f_repos/sub/fuel-mirror b/build/f_repos/sub/fuel-mirror
new file mode 160000
+Subproject d1ef06b530ce2149230953bb3810a88ecaff870
diff --git a/build/f_repos/sub/fuel-nailgun-agent b/build/f_repos/sub/fuel-nailgun-agent
new file mode 160000
+Subproject 46fa0db0f8944f9e67699d281d462678aaf4db2
diff --git a/build/f_repos/sub/fuel-ostf b/build/f_repos/sub/fuel-ostf
new file mode 160000
+Subproject f09c98ff7cc71ee612b2450f68a19f2f9c64345
diff --git a/build/f_repos/sub/fuel-ui b/build/f_repos/sub/fuel-ui
new file mode 160000
+Subproject 90de7ef4477230cb7335453ed26ed4306ca6f04
diff --git a/build/f_repos/sub/fuel-upgrade b/build/f_repos/sub/fuel-upgrade
new file mode 160000
+Subproject c1c4bac6a467145ac4fac73e4a7dd2b00380ecf
diff --git a/build/f_repos/sub/fuel-web b/build/f_repos/sub/fuel-web
new file mode 160000
+Subproject e2b85bafb68c348f25cb7cceda81edc668ba2e6
diff --git a/build/f_repos/sub/network-checker b/build/f_repos/sub/network-checker
new file mode 160000
+Subproject fcb47dd095a76288aacf924de574e39709e1f3c
diff --git a/build/f_repos/sub/python-fuelclient b/build/f_repos/sub/python-fuelclient
new file mode 160000
+Subproject 67d8c693a670d27c239d5d175f3ea2a0512c498
diff --git a/build/f_repos/sub/shotgun b/build/f_repos/sub/shotgun
new file mode 160000
+Subproject 781a8cfa0b6eb290e730429fe2792f2b6f5e0c1