Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 6dbe77db6d655d0d2d684d353d892d353c217db5
  - Merge "Adding Ubuntu support in Ansible - dns role"
  - Adding Ubuntu support in Ansible - dns role

    Extending ansible playbooks of ubuntu support.
    Creating new test with Ubuntu image for Molecule in dns role.

    Issue-ID: OOM-1671
    Signed-off-by: Jan Benedikt <j.benedikt@partner.samsung.com>
    Change-Id: I414df46093fd300891b9df44e12a0225495cc906

diff --git a/docs/submodules/oom/offline-installer.git b/docs/submodules/oom/offline-installer.git
index f00d15a..6dbe77d 160000 (submodule)
--- a/docs/submodules/oom/offline-installer.git
+++ b/docs/submodules/oom/offline-installer.git
@@ -1 +1 @@
-Subproject commit f00d15abae00005389cf956e194cf2abf2119f17
+Subproject commit 6dbe77db6d655d0d2d684d353d892d353c217db5