Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "fuel-deploy.sh: Preserve env vars in sudo call"
  - fuel-deploy.sh: Preserve env vars in sudo call

    SSH_KEY and other env vars set by Jenkins should be preserved
    when using sudo to invoke the Fuel deploy script.

    JIRA: FUEL-280

    Change-Id: I495589a4a0519b3a5052cd5e5dc3122f9e49c215
    Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index a6241f7..c897c28 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit a6241f704f8f8563d7e8fa398f1241fac7031b62
+Subproject commit c897c28c442e9f32e760d6d575df109b448b2313