Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Rework creating tags & branches from release files
    
    Old method could not properly handle both branching and
    tagging on changes to the release file.
    
    Proposed method:
    jjb calls:
    jjb/releng/branch-or-tag.sh
    for both verify and merge jobs.
    
    branch-or-tag determins nature of the change to
    "releases/branch/project.yaml"
    and calls
     releng-release-tagging.sh
    or
     releng-release-create-branch.sh
    
    The scripts above handle both verify and merge operations
    
    based on
      if [[ $TAG_EXISTS = false && "$JOB_NAME" =~ "merge" ]];
    and
      if [[ $REF_EXISTS = true && "$JOB_NAME" =~ "merge" ]]; then
    
    both scripts check that the ref exits in verfiy and merge stages.
    
    if releng-release-create-branch.sh creates a branch it then also
    calls releases/scripts/create_jobs.py
    
    Change-Id: Ieb99de5e4df100af59ecc818f52b0831383b2b62
    Signed-off-by: Aric Gardner <agardner@linuxfoundation.org>
    

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