Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 644d03aeb7e5e68187ab952c752b7d5e818864f7
  - Merge "Change cert signing from command to module"
  - Change cert signing from command to module

    With newer Ansible we are now able to sign nexus certificate
    with own CA using openssl_certificate module.

    Issue-ID: OOM-1700

    Change-Id: Idc54955160caef4a57bd50fc86678923511b5bce
    Signed-off-by: Milan Verespej <m.verespej@partner.samsung.com>

diff --git a/docs/submodules/oom/offline-installer.git b/docs/submodules/oom/offline-installer.git
index c3bdc32..644d03a 160000 (submodule)
--- a/docs/submodules/oom/offline-installer.git
+++ b/docs/submodules/oom/offline-installer.git
@@ -1 +1 @@
-Subproject commit c3bdc3210bbaf715805059bfef9b182051b3aa0c
+Subproject commit 644d03aeb7e5e68187ab952c752b7d5e818864f7