Implement error handling test suite

[nibb13]

• no API call set (-c)
• no account ID set (-I)
• no account key set (-K)
• no message title set (-t)
• no message body set (-T)
• no UIDs / UID set for multicast / unicast call (-U)
• malformed UIDs for multicast call
• malformed UID for unicast call
• wrong API call set (-c wrongapicall)
• wrong command supplied
• curl error (server is unreachable)
• API error (malformed data etc.)
• multiple instance queue run
• all applicable to broadcast API tests above
• all applicable to multicast API tests above
• all applicable to unicast API tests above
• Rich Push Notification malformed params handling