Adding missing tests for regex and black-regex in tempest run
Adding missing tests for regex and black-regex in tempest run

This patch will add the missing test cases for regex parameter
and black-regex parameter in tempest run command.
These tests will helps in coverage of tempest run CLI.

Change-Id: I860689178ddaf927fdfb2921561e6c124bc0da49
Partially-Implements: blueprint tempest-cli-unit-test-coverage

masayukig/tempest,openstack/tempest,cisco-openstack/tempest,masayukig/tempest,cisco-openstack/tempest,openstack/tempest