Enhance message for watch rule

When heat engine log message for watch rule, it will log message
as following:
WATCH: stack:86ef85cb-994c-4481-bb4d-2bb556236dbd,
watch_name:a1-MEMAlarmHigh ALARM

We should update it to:
WATCH: stack:86ef85cb-994c-4481-bb4d-2bb556236dbd,
watch_name:a1-MEMAlarmHigh, new_state:ALARM

This patch also enables I18N for this log message.

Change-Id: I23a825a8b5bed621c7d3fc3e582e853e52a3e69d
Merge "Enhance message for watch rule"