Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Fix the parameter of scenario directories

    1. the "+" and "'" will be part of the string in the path parameter of ansible.
       So the directories we create are not right. we need remove these char.
    2. it miss the "{{" in ansible variable

    Change-Id: I30c9804450588c63f5f18c63c1d90cd869fad90e
    Signed-off-by: wutianwei <wutianwei1@huawei.com>

diff --git a/docs/submodules/releng-xci b/docs/submodules/releng-xci
index 1a68730..6503c6f 160000 (submodule)
--- a/docs/submodules/releng-xci
+++ b/docs/submodules/releng-xci
@@ -1 +1 @@
-Subproject commit 1a68730ab76b3fad4395f1cca0d3590c0507d378
+Subproject commit 6503c6fbac486c38d7898656985c68d46b24ffe0