Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Add SNAPS as a pip requirement

    - Remove common OpenStack requirements
    - Will result in conflicts
    - Use SNAPS built from master branch

    JIRA: STORPERF-227

    Change-Id: Ie4facfa092bafefe15168042fb94ea7ff9bac7d0
    Signed-off-by: Taseer Ahmed <taseer94@gmail.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index aea749b..3fb6bd9 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit aea749b49ba32fce47b17f98302bfd7053d40668
+Subproject commit 3fb6bd94d5df85111b98caf58eca256949c08060