Make sure report_interval is less than service_down_time

If service_down_time is less than report_interval, services will
routinely be considered down, because they report in too rarely.
Add check for service_down_time vs report_interval, if report_interval
is larger than service_down_time, automatically change
service_down_time to be report_interval * 2.5

DocImpact

Closes bug #1255685

Change-Id: I1be42e1826142b8f3f2c39f3734bef713a12a693
Merge "Make sure report_interval is less than service_down_time"