Option Name:icap_service_revival_delay
Replaces:
Requires:--enable-icap-client
Default Value:icap_service_revival_delay 180
Suggested Config:

	The delay specifies the number of seconds to wait after an ICAP
	OPTIONS request failure before requesting the options again. The
	failed ICAP service is considered "down" until fresh OPTIONS are
	fetched.

	The actual delay cannot be smaller than the hardcoded minimum
	delay of 30 seconds.