Fix the verdict of sub test cases

Fix the verdict of sub test cases

Error to group skipped sub test cases to passed one.
Example:
Skipped sub test case will be parsed as passed in following case.

skipped sub test case:
tempest.api.network.test_routers.RoutersTest.test_create_show_list_update_delete_router

passed sub test case list includes this one:
tempest.api.network.test_routers.RoutersTest.test_add_remove_router_interface_with_subnet_id

Then the skipped one will be checked as pass.

JIRA: DOVETAIL-775

Change-Id: I449f4968c23a9def1177a7c9645e5dcb89b2ec30
Signed-off-by: xudan <xudan16@huawei.com>