Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Standardize Output

    Re-arrange the JSON output so that it matches the format that
    gets sent and retrieved from the testresults db.

    Change-Id: I9f15e553e94b27b9e5a36f4984789c5e710feac4
    JIRA: STORPERF-200
    Signed-off-by: mbeierl <mark.beierl@dell.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 6848d51..b4421c8 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 6848d519dfa7c8aec38ab6d084df3d08196c0ad3
+Subproject commit b4421c8b61c183d57ef4acc6874cc8e02c65d633