Update git submodules

* Update docs/submodules/storperf from branch 'stable/euphrates'
  - Fixing test results.

    Change-Id: I13ea847491f2758fd2003c0b206ec7a1356f3fb2
    JIRA: STORPERF-216
    Signed-off-by: mbeierl <mark.beierl@dell.com>
    (cherry picked from commit aa2fb5acde380188b063131c5c3c48e637ca6b9f)

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 6980672..ece1b8f 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 698067204fdaab2ca512a96a111f730c4466ba5e
+Subproject commit ece1b8ff90f6e1818ae5b14991383edfae07c5d1