Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Generalize Gerrit non-voting Review Macro Name"
  - Generalize Gerrit non-voting Review Macro Name

    This patch updates the 'report-docs-build-result-to-gerrit' macro name
    to reflect that it can work well for more than just the opnfvdocs project.

    To take advantage of this macro a build merely needs to write
    out the file 'gerrit_comment.txt' with the information they want posted
    back to gerrit, and include the macro in the list of builders.

    Change-Id: Ifbdc5734fe7e7231be0cfd16d6b8d69cb1383bfd
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>