Update git submodules

* Update docs/submodules/releng from branch 'master'
  to 2e7105fe7f67ec98b375368424ddc567e4c95497
  - Fix a few hardcoded tags (latest)

    It avoids side effects if new Airship branches.

    Change-Id: Ib84d6634cfee876ea922e3dd8a2c2285e593c907
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index cd191eb..2e7105f 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit cd191ebecb331bad1ebc2e49d784a9e6c19aef8b
+Subproject commit 2e7105fe7f67ec98b375368424ddc567e4c95497