Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fuel, armband: basic healthcheck in verify jobs"
  - fuel, armband: basic healthcheck in verify jobs

    Enable Functest based gating for jobs:
    - fuel-verify-*
    - armband-verify-*
    This includes Functest suite 'healthcheck' and testcase 'vping_ssh',
    similar to Compass4NFV verify jobs.

    While at it, remove 'basic' phase from verify jobs, as linting is
    handled via separate jobs on Jenkins master and there's no other
    reason to keep it around.

    JIRA: FUEL-340

    Change-Id: I11dce6998d7ac16e68cf2b9d72a1ed6b23ca2483
    Signed-off-by: ting wu <ting.wu@enea.com>
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index d29c3e4..2a556f8 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit d29c3e495aee81b96f653b6a4b5ee72a9bf33976
+Subproject commit 2a556f8b1db01fa137f6596862dc39e229cfa276