Update git submodules

* Update docs/submodules/oom.git from branch 'master'
  to e6f4bc0caefe13cf20e316274611537b195d57a6
  - Merge "Change ownership of persistent vol mount"
  - Change ownership of persistent vol mount

    Persistent volumes must be writable by non-root user odl.  So,
    change ownership of the mount to odl user.

    Change-Id: Ie2ff285bd623a7b69289bc438ff16a2724fd7ded
    Issue-ID: SDNC-749
    Signed-off-by: Timoney, Dan (dt5972) <dtimoney@att.com>

diff --git a/docs/submodules/oom.git b/docs/submodules/oom.git
index defe9ad..e6f4bc0 160000 (submodule)
--- a/docs/submodules/oom.git
+++ b/docs/submodules/oom.git
@@ -1 +1 @@
-Subproject commit defe9ad0c9e20bd49fb99f31931d867c33a7827b
+Subproject commit e6f4bc0caefe13cf20e316274611537b195d57a6