Update git submodules

Update git submodules

* Update docs/submodules/parser from branch 'master'
  - Update the parser's version after publish 0.5.0 for onap

    1. git tag 0.5.0   git push origin 0.5.0
    2. set apigateway version empty
       set toscaparser version empty
       set heat-translator version empty
       version management use git tag, note: tag name must be started with
    digit

    JIRA: PARSER-147

    Change-Id: I71cc9b910bce57eebf4c07976bd24efd441048fa
    Signed-off-by: shangxdy <shang.xiaodong@zte.com.cn>