Update git submodules

* Update docs/submodules/storperf from branch 'master'
  - Merge "Update release notes"
  - Update release notes

    Updates release notes for Euphrates
    * Changes in Sections
    * Tags not specified so used euphrates.1.0
    * Add details of logs' availability

    Change-Id: I6fe021a85aed03d033d34fb83b489ca24dc5950f
    JIRA: STORPERF-211
    Signed-off-by: Shrenik <shrenik.jain@research.iiit.ac.in>

diff --git a/docs/submodules/storperf b/docs/submodules/storperf
index 5f6100a..d430218 160000 (submodule)
--- a/docs/submodules/storperf
+++ b/docs/submodules/storperf
@@ -1 +1 @@
-Subproject commit 5f6100a6a86536a4d1b1fa0a238a451aba92f844
+Subproject commit d4302185cd9eb2a3b15dcb43ccee0ae525be35e2