Update git submodules

* Update docs/submodules/parser from branch 'stable/euphrates'
  - Add coverage test item

    Currently there is no coverage report, so it's necessary to add covrage
    test for parser.

    JIRA: PARSER-159

    Change-Id: I7688b2c7e3adc8d0009e5edf33be41c7c75a5d87
    Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>

diff --git a/docs/submodules/parser b/docs/submodules/parser
index 4525b0d..2320606 160000 (submodule)
--- a/docs/submodules/parser
+++ b/docs/submodules/parser
@@ -1 +1 @@
-Subproject commit 4525b0dc066d17e4f7818d39801ca6b8f02aca13
+Subproject commit 23206060d55f39e3e95c21aee9c80164653dc164