Get Base URI from right arg
Do not break out early if argc count is wrong
Pass in test_string arg to allow running one test out of suite

(manifest_testsuite_run_suite): Add test_string arg and use it to
check for test name or test literal match.

(manifest_manifests_run): Add test_string arg for above.

(main): Add -t  / --test arg for setting a test to run.