Description of problem:
Add ability to run test.sh with specified tests. It can be looks like:
$ ./test.sh test_${TEST_1} & test_${TEST_2}

Version-Release number of selected component (if applicable):
1.15

How reproducible:
100%

Steps to Reproduce:
1.Run /beakerlib/src/test/test.sh test_${TEST_1} & test_${TEST_2}
or 
2. /beakerlib/src/test/test.sh test_${TEST_1} test_${TEST_2}

Actual results:
command not found...

Expected results:
Both tests were ran 

Additional info: