Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Include global-jjb v0.15.0"
  - Include global-jjb v0.15.0
    
    Global-JJB[1][2] is a collection of reusable JJB templates created by The
    Linux Foundation Release Engineering team.
    
    Using it will allow OPNFV to take advantage of the Release Engineering
    work being done across all the other Linux Foundation projects.
    
    Including the submodule won't affect current jobs as templates aren't
    used until they are listed in a job definition. New releases of
    global-jjb won't affect our jobs since the submodule is pointed at a tag
    and needs to be manually updated to a new release.
    
    [1] https://github.com/lfit/releng-global-jjb
    [2] http://docs.releng.linuxfoundation.org/projects/global-jjb/en/latest/index.html
    
    Change-Id: Id1548438b57df177a7a37cb3ed5de6ae0febab3d
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>
    

1 files changed, 0 insertions, 0 deletions

diff --git a/docs/submodules/releng b/docs/submodules/releng
-Subproject 18fa393967bcb95ebdd4f32f55385ba65dbe963
+Subproject b87f1d4130984073ed11989f06c7ccf6a28985d