Bug 1066947 - Alert being triggered twice if the Operation Execution has the status set to In Progress

Changed the wording of the alert condition editor to indicate the user is going to monitor an operation status change.
Call #notifyAlertConditionCacheManager only if the operation history status has changed.

(cherry picked from commit c09e9440f19b97dd6b3a353fc3880afefd4d3222)
Signed-off-by: Jay Shaughnessy <jshaughn@redhat.com>