Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Pinning version of Swagger UI

    Changes the inclusion of Swagger UI to become a git checkout
    of a fixed version rather than following the head.

    Change-Id: I30def6d6c37a166cc37f15857a98064c760eb7c6
    JIRA: STORPERF-123
    Signed-off-by: mbeierl <mark.beierl@dell.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 902a4a4..67ef3ea 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 902a4a4f915f0f186f66b566b1744667c7ee9572
+Subproject commit 67ef3ea942d5d2eaff46572936f12d4ccab4d89c