Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Merge "Collect slave info"
  - Collect slave info

    Adds the output of uname -a to the metadata for each
    slave.  Additional information about each slave can
    also be added as needed in the future.

    Change-Id: Ifb3d06599c0f1b7a4ffe06a7c98b151e62ba7bd8
    JIRA: STORPERF-253
    Signed-off-by: mbeierl <mark.beierl@dell.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 5795182..f96c968 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 57951825e36f7eeb81c26ce6dca2f0cace7c919f
+Subproject commit f96c968bb5e8149354a3f31c6e704ce821e5d813