Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to 97a93cad5286e57921b5e635379cbb7f1d843d55
  - Merge "Remove artifacts left by 'dns' role tests"
  - Remove artifacts left by 'dns' role tests

    'dnsmasq.tar' docker image file will be removed
    after test invocation.

    Change-Id: I29668ece8c745794ad9462e527ca144bea6f4fc2
    Issue-ID: OOM-1943
    Signed-off-by: Bartek Grzybowski <b.grzybowski@partner.samsung.com>

diff --git a/docs/submodules/oom/offline-installer.git b/docs/submodules/oom/offline-installer.git
index 9591bbf..97a93ca 160000 (submodule)
--- a/docs/submodules/oom/offline-installer.git
+++ b/docs/submodules/oom/offline-installer.git
@@ -1 +1 @@
-Subproject commit 9591bbf978d8e738143f4a94b6df7045e4074f78
+Subproject commit 97a93cad5286e57921b5e635379cbb7f1d843d55