Update git submodules

* Update docs/submodules/parser from branch 'master'
  - Merge "Add required parameters validation for nested service"
  - Add required parameters validation for nested service

    Add validation for SDC from ONAP when use parse in design time: ignore
    nested parameters(inputs and outputs) validation and only print warning
    message.

    JIRA: PARSER-141

    Change-Id: Idd3b35a197594e9a7ff38024f16acfa650728bd1
    Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>

diff --git a/docs/submodules/parser b/docs/submodules/parser
index 6b7f693..a224201 160000 (submodule)
--- a/docs/submodules/parser
+++ b/docs/submodules/parser
@@ -1 +1 @@
-Subproject commit 6b7f69347669e8a8e12e09774935c76e30654eb3
+Subproject commit a224201e408aca8424b076b5e46138b5e322a9ef