run_tests: add suite and test arguments
run_tests: add suite and test arguments

Now it's easy to run one specific test.

Examples:

$ ./run_tests cmdtests cmd-list cmd-review

* Running pwcli cmdtests
test 2/2: cmd-review
2/2 tests OK, 0 failures

$ ./run_tests unittests
* Running unit tests
.........
----------------------------------------------------------------------
Ran 9 tests in 0.203s

OK

$ ./run_tests -h
usage: run_tests [-h] [SUITE] [TEST [TEST ...]]

Run all sort of pwcli tests

positional arguments:
  SUITE       Choose the test suite to run
  TEST        Run a specific test (or tests) from a test suite

optional arguments:
  -h, --help  show this help message and exit

Signed-off-by: Kalle Valo <7081a7d99b8c74c0698a728df19e3915a995d7e1@codeaurora.org>

kvalo/pwcli,kvalo/pwcli