Update git submodules

* Update docs/submodules/storperf from branch 'stable/euphrates'
  - Implementing the extension: Display of Steady State Convergence Report - All block sizes

    In addition, introducing an intermediary page for single json portal.
    JIRA: STORPERF-141

    Change-Id: I6dd7f43b1f0fd8293c4872e6a7c3ef909f2ddb83
    Signed-off-by: saksham115 <saksham.agrawal@research.iiit.ac.in>
    (cherry picked from commit d2d266292c56ec3e4f87a503cba083e0f79376c7)

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 11b2508..6fb65be 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 11b25082420e359dfaf2e36eacd533d1f5b49aa9
+Subproject commit 6fb65bef51c32e73a06f5ba135544e19e6342c8a