Ignore RHEVM user login failed events

This doesn't fix bug 1114656, but it does address part of the problem of
grabbing way too many RHEVM events for historical processing.

[skip ci]

https://bugzilla.redhat.com/show_bug.cgi?id=1114656
Merge pull request #1183 from blomquisg/bz1114656-rhev-historical-events

Ignore RHEVM user login failed events