Allow regex for blacklist scenarios/installers

Allow regex for blacklist scenarios/installers

Reasoning: Some blacklisted test cases apply to a range of scenarios,
e.g. both 'ha' and 'noha' and possibly even to all scenarios for
a specific installer -- therefore the list of excluded scenarios can
get long and unclear. For consistency with rally test case scenarios
also allow regex for installers specification.

Additionally, log the excluded test cases (if any) to debug log.

Change-Id: Ie0bec35d1a6443203d4719ea5428c437c12e5e12
Signed-off-by: Martin Kulhavy <martin.kulhavy@nokia.com>