[HUBZERO][#4301][PLG_SYSTEM_HUBZERO] update system plugin to capture joomla's renaming of onLoginFailure event to onUserLoginFailure
[HUBZERO][#4301][PLG_SYSTEM_HUBZERO] update system plugin to capture joomla's renaming of onLoginFailure event to onUserLoginFailure

zweidner/hubzero-cms,zweidner/hubzero-cms,anthonyfuentes/hubzero-cms,zweidner/hubzero-cms,anthonyfuentes/hubzero-cms,zooley/hubzero-cms,zweidner/hubzero-cms,anthonyfuentes/hubzero-cms,anthonyfuentes/hubzero-cms,zooley/hubzero-cms,zooley/hubzero-cms,zooley/hubzero-cms