Update git submodules

* Update docs/submodules/releng/builder from branch 'master'
  to c4941c962a803dde9193c2757d8e8878c792c515
  - Add common-functions.sh bash lib

    tired of looking at duplicated code and having to remember to
    search for all instances of it. This can be the start of some
    cleanup, if others agree it's a good idea.

    first round:
      - move the Java vars setup code to a common function.
      - move some common vars to common location as well
      - added "export" to some vars to get around local tox
        shellcheck error

    Change-Id: If03949e16aae3561ac8636bc4de0b1a17dad01ae
    Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>

diff --git a/docs/submodules/releng/builder b/docs/submodules/releng/builder
index 7103942eac7517f3e0573952b2b0e91d1d3a1d3c..c4941c962a803dde9193c2757d8e8878c792c515 160000 (submodule)
--- a/docs/submodules/releng/builder
+++ b/docs/submodules/releng/builder
@@ -1 +1 @@
-Subproject commit 7103942eac7517f3e0573952b2b0e91d1d3a1d3c
+Subproject commit c4941c962a803dde9193c2757d8e8878c792c515