Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to aa32f08892e45208312e3c4e4f9b3bcdd250d8cd
  - Merge "Building and Dockerfile for centos7"
  - Building and Dockerfile for centos7

    Add initial Dockerfile for centos7 for molecule testing.

    Issue-ID: OOM-1750

    Change-Id: Ie4da3d80c713d1da56465c598774b370b4c01b36
    Signed-off-by: Samuli Silvius <s.silvius@partner.samsung.com>

diff --git a/docs/submodules/oom/offline-installer.git b/docs/submodules/oom/offline-installer.git
index 0dddfce..aa32f08 160000 (submodule)
--- a/docs/submodules/oom/offline-installer.git
+++ b/docs/submodules/oom/offline-installer.git
@@ -1 +1 @@
-Subproject commit 0dddfce1980acf89088f7812bc6cafe7b77f83d7
+Subproject commit aa32f08892e45208312e3c4e4f9b3bcdd250d8cd