Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Add a volume mapping for Bottlenecks

    All results files including the .out files are stored in Yardstick /tmp
    Need to map that with host's /tmp to parse the results.

    JIRA: DOVETAIL-727

    Change-Id: I5a81e6e6bdf79b2e0074df505deb425c37b93300
    Signed-off-by: xudan <xudan16@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index e8afeeb..7c94c0e 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit e8afeeb4d039505f998020bad26106640d1f3e4c
+Subproject commit 7c94c0e8de23a090bf4530d573d689073f67b15f