Corrects time unit conversion for the Sync Interval config property
for LdapUserGroupProvider in authorizers.xml.
Also enforces a minimum value of 10 secs for the Sync Interval to help
catch unintentional misconfigurations, for example users upgrading
from previous versions, where tiny Sync Interval values could be set
as a workaround for NIFI-4667.
This closes#2341