Allow whois binary to be specified

See #10
updated check_cloudera_manager_metrics.pl
updated lib
libraried out core cloudera manager bits for other impending plugins
updated check_cloudera_manager_metrics.pl
updated lib
added check_hortonworks_ambari.pl
updated lib
refactored out more code to lib HariSekhon::ClouderaManager
updated check_cloudera_manager_metrics.pl
updated lib
added check_cloudera_manager_license.pl
updated lib
added check_cloudera_manager_version.pl
updated check_cloudera_manager_version.pl
updated check_cloudera_manager_version.pl
added check_cloudera_manager_cluster_version.pl
updated lib
added check_cloudera_manager_service_state.pl
updated lib