ipatests: relax requirements for time server quality
When synchronizing time with windows server using chronyd I often see
error "No suitable source for synchronisation". This happens because chronyd
with default options refuses to use time servers with big jitter and delay.
For some reasons Windows time server does have big jitter. In some test setups
delay also can be rathe big.
Related to https://pagure.io/freeipa/issue/7889
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>