Update git submodules

Update git submodules

* Update docs/submodules/releng from branch 'master'
  - Merge "make website accessible via testresults.opnfv.org/test"
  - make website accessible via testresults.opnfv.org/test

    Currently, testapi website can not be fully accessed through
    testresults.opnfv.org/test, due to http://testresults.opnfv.org/test is
    not a root url. In this patch leverage relative path to make it accessible

    Change-Id: I56983d2221791d8a060039ec829278d31ecb5048
    Signed-off-by: SerenaFeng <feng.xiaowei@zte.com.cn>