Update git submodules

* Update docs/submodules/dovetail from branch 'master'
  - Merge "https+credential support"
  - https+credential support

    JIRA: DOVETAIL-440

    Change-Id: I69fb96673755545e8e0d78d940870195dbf20a0b
    Signed-off-by: MatthewLi <matthew.lijun@huawei.com>

diff --git a/docs/submodules/dovetail b/docs/submodules/dovetail
index 2c17036..d7795dd 160000 (submodule)
--- a/docs/submodules/dovetail
+++ b/docs/submodules/dovetail
@@ -1 +1 @@
-Subproject commit 2c170360711d8307ffab3fe8070a771650e4fd47
+Subproject commit d7795dd0b6e10c335dba65f1456d43fee50c121f