Update git submodules

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

    Show sample of standardized JSON output for single
    job run.

    Change-Id: Iec20cdcb3de02550bdca5da6257be21cbb4c0c1f
    JIRA: STORPERF-203
    Signed-off-by: mbeierl <mark.beierl@dell.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 7c5d697..8969493 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 7c5d697a39df3307049e5e07b3d4696360043777
+Subproject commit 8969493e12b6573ab0655d88540135a6e9f757b3