build: Rework patch mechanism for Fuel submodules

While refactoring the patching mechanism, take care of:
- Sync submodule handling with Fuel@OPFNV;
- build: Investigate/prepare for moving patches to Fuel@OPNFV;
- build: Investigate divergent fuel-mirror;
- ISO build: cacheid for Fuel comps should not depend on
  Armband git commit;

CHANGE:
 Rename/shuffle patches while grouping them in "features",
 preparing for upstreaming them to Fuel@OPNFV and beyond.

CHANGE:
 Allow linking patches for better representing the dependency
 between one patch and different features.
 e.g. 0001-Add-arch-to-nailgun-release-and-target-image.patch:
   - part of `multiarch-fuel`, because it extends Fuel;
   - part of `direct-kernel-boot`, as arch is required for that;
   - part of `cross-bootstrap`, target image is arch-dependent;
 NOTE: Patch links are not staged to Fuel@OPNFV, they only serve
 as markers that a specific patch is part of a feature.

CHANGE:
 Kill all Fuel component submodules, now handled in Fuel@OPNFV:
  - fuel-agent
  - fuel-astute
  - fuel-library
  - fuel-mirror
  - fuel-nailgun-agent
  - fuel-web

CHANGE:
 Move armband-fuel-config.mk to armband git root.

FIXME: m1.micro-Increase-profile-RAM-size-to-128MB.patch is NOT
 part of `cross-bootstrap` feature, but patch context says so ...

FIXME: 0001-Add-arm64-deb-repositories-setup.patch is broken at
 `make patches-export` by removing spaces at EOL.

v2 -> v3:
 * Phony patch support (links to show a patch belongs to a feature);
 * Updated README.md
v3 -> v7:
 * Re-export Fuel submodules & plugins patches (update patch context);
 * Update Cavium mail addresses (s/caviumnetworks.com/cavium.com/);
 * Ignore submodule changes;
 * Add armband git repo info to gitinfo_fuel.txt at build time;

Implements: ARMBAND-136
Closes-bug: ARMBAND-95
Closes-bug: ARMBAND-93
Closes-bug: ARMBAND-92

Change-Id: I1a236d9f43b2e6dca22055911f696b43c22b5973
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

1 files changed, 0 insertions, 55 deletions

diff --git a/patches/fuel-agent/0003-Fix-qemu-user-static-replacement.patch b/patches/fuel-agent/0003-Fix-qemu-user-static-replacement.patch
deleted file mode 100644
index a4f65d68..00000000
--- a/patches/fuel-agent/0003-Fix-qemu-user-static-replacement.patch
+++ /dev/null
@@ -1,55 +0,0 @@
-From: Stanislaw Kardach <stanislaw.kardach@caviumnetworks.com>
-Date: Sun, 6 Mar 2016 16:09:39 +0100
-Subject: [PATCH] Fix qemu-user-static replacement
-
----
- fuel_agent/manager.py     |  6 ++++++
- fuel_agent/utils/build.py | 18 ++++++++++++++++++
- 2 files changed, 24 insertions(+)
-
-diff --git a/fuel_agent/manager.py b/fuel_agent/manager.py
-index f613aef..6322a10 100644
---- a/fuel_agent/manager.py
-+++ b/fuel_agent/manager.py
-@@ -587,6 +587,12 @@ class Manager(object):
-         fu.mount_bind(chroot, '/proc')
-         bu.populate_basic_dev(chroot)
- 
-+        # we need to make sure that qemu-{target_arch}-static binary is
-+        # not replaced inside chroot because we're possibly using it
-+        # through qemu-debootstrap
-+        LOG.debug('Preventing qemu-user-static replacement inside chroot')
-+        bu.prevent_qemu_replacement(chroot, CONF.target_arch)
-+
-     def destroy_chroot(self, chroot):
-         # Umount chroot tree and remove images tmp files
-         if not bu.stop_chrooted_processes(chroot, signal=signal.SIGTERM):
-diff --git a/fuel_agent/utils/build.py b/fuel_agent/utils/build.py
-index 6f31732..abd762e 100644
---- a/fuel_agent/utils/build.py
-+++ b/fuel_agent/utils/build.py
-@@ -312,6 +312,24 @@ def populate_basic_dev(chroot):
-     utils.execute('chroot', chroot,
-                   'ln', '-s', '/proc/self/fd', '/dev/fd')
- 
-+def prevent_qemu_replacement(chroot, arch):
-+    """Prevents qemu-user-static replacement inside chroot.
-+
-+    Use dpkg-divert to prevent replacing qemu-user-static binary inside
-+    chroot which is necessary for host-side qemu-debootstrap to work
-+    properly."""
-+    if arch == 'arm64':
-+        qemu = 'qemu-aarch64-static'
-+    elif arch == 'amd64':
-+        qemu = 'qemu-x86_64-static'
-+    utils.execute('chroot', chroot,
-+                  'dpkg-divert', '--divert', '/usr/bin/%s.orig' % qemu,
-+                  '/usr/bin/%s' % qemu)
-+    utils.execute('chroot', chroot,
-+                  'dpkg-divert', '--divert', '/usr/sbin/update-binfmts.orig',
-+                  '--rename', '/usr/sbin/update-binfmts')
-+    utils.execute('chroot', chroot, 'ln', '-sf', '/bin/true',
-+                  '/usr/sbin/update-binfmts')
- 
- def create_sparse_tmp_file(dir, suffix, size=8192):
-     """Creates sparse file.