Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "Enable dovetail daily jobs on Fuel/armband Euphrates and master"
  - Enable dovetail daily jobs on Fuel/armband Euphrates and master

    Dovetail only ran against fuel danube release before.
    It needs to run against fuel euphrates and master because Dovetail team
    is planning the 2nd release which is based on OPNFV Euphrates.

    Change-Id: I2c39d53a16ca6dbf8eda31943f09896cf7ee35c6
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/releng b/docs/submodules/releng
index b289ef9..79715f6 160000 (submodule)
--- a/docs/submodules/releng
+++ b/docs/submodules/releng
@@ -1 +1 @@
-Subproject commit b289ef90894a8c2255f199c567bd030389755621
+Subproject commit 79715f619ee9f6b83b84bafd04f9b07ac3a78f2d