Update git submodules

* Update docs/submodules/bottlenecks from branch 'stable/euphrates'
  - Testcase to find storage bottlenecks using Yardstick for Multistack

    JIRA: BOTTLENECK-217

    This patch is used to find storage bottlenecks while using
    yardstick for multistack.

    Change-Id: I8e64ff4145244a4aa822cf63c82d3a90a6579486
    Signed-off-by: Shubham Agarwal <shubham.agarwal.coder@gmail.com>
    (cherry picked from commit d179445063b05071125ec7fb33432f1d802bafaf)

diff --git a/docs/submodules/bottlenecks b/docs/submodules/bottlenecks
index b155081..41c5fa7 160000 (submodule)
--- a/docs/submodules/bottlenecks
+++ b/docs/submodules/bottlenecks
@@ -1 +1 @@
-Subproject commit b1550810eb2ed1203efb55ecdbc8dd7865274340
+Subproject commit 41c5fa710143498c5bf20608f99d7a29e10c33b1