Update git submodules

Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to 79652b59dc80982e0780196e4c34070aca6eafe9
  - Merge "Expand rendered image name to include secs and ms"
  - Expand rendered image name to include secs and ms

    Expand rendered image name to include seconds and milliseconds. This
    reduces the probability of image name collisions on the cloud from 1/60
    to 1/60000. Fixed upstream in common-packer [1.].

    [1.] https://gerrit.linuxfoundation.org/infra/#/c/10986/

    https://jira.linuxfoundation.org/browse/RELENG-971

    Change-Id: If8a808681be6e4dea942e6f928628e57f4f1090d
    Signed-off-by: Anil Belur <abelur@linuxfoundation.org>