Update git submodules

* Update docs/submodules/storperf from branch 'stable/euphrates'
  - Fixing Results DB Keys

    Update keys pushed to testresults DB so they match
    the expected values.

    JIRA: STORPERF-216

    Change-Id: I837254fbfb2837d6abfc22d6d33878f60227480c
    Signed-off-by: mbeierl <mark.beierl@dell.com>
    (cherry picked from commit c0571183df86501bb626079b40a36a0d06e6e4f1)

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 88e91c1..492d9cc 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 88e91c18f8058aa914274c7737a00444889a3a61
+Subproject commit 492d9cca59f039ccded727f454b7014c32a5cf19