fix(3042): Stage functional test regex

[tkyi]

Context

Stage functional test is failing with the error:

19:46:51    ? Then the "stage@setup_fail" stageBuild status is "FAILURE"
19:46:51        Undefined. Implement with the following snippet:
19:46:51 
19:46:51          Then('the {string} stageBuild status is {string}', function (string, string2) {
19:46:51            // Write code here that turns the phrase above into concrete actions
19:46:51            return 'pending';
19:46:51          });

Objective

This PR relaxes regex for stage functional test.

References

Related to #3061, #3042

License

I confirm that this contribution is made under a BSD license and that I have the authority necessary to make this contribution on behalf of its copyright owner.

[coveralls]

coverage: 95.29%. remained the same
when pulling 199996f on func_stage_fix
into d46fbd9 on master.