* Update docs/submodules/functest from branch 'master'
- Merge "Obtain build_tag by CONST instead of get function"
- Obtain build_tag by CONST instead of get function
JIRA: FUNCTEST-763
Change-Id: I86b0b515a3d51df20a35c2aeb461a95d0c5797fd Signed-off-by: Linda Wang <wangwulin@huawei.com>