Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Fixing Suprious Exception

    When the results are too small to calculate
    the slope, an exception is reported in the
    logs.  This change avoids triggering the
    exception criteria.

    Change-Id: Iae886cde6244e9077ff94812bd830c48adaef365
    Signed-off-by: mbeierl <mark.beierl@dell.com>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 5051297..5930150 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 5051297e7294406453ac4ff2e14f35762a77b249
+Subproject commit 5930150915999fd410d7a2da38723065bcf7c91f