Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Blacklist rally ceilometer scenarios"
  - Blacklist rally ceilometer scenarios

    Exclude ceilometer test cases since Rally is still utilizing the API
    which was deprecated in Pike.

    Change-Id: I33be7358c14988f94d38d4b9d42995bd5f022617
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5c20154..7510ff6 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 5c20154ceafd6d2dc1e625e2e1b5bc335f1084a6
+Subproject commit 7510ff6e0e8e66fa6aa85bd7fb5e698ed66256d8