Deprecate log_icap and log_access configuration directives

Deprecate log_icap and log_access configuration directives

The log_icap and log_access are not really needed to control requests logging.
Someone can use acls  with access_log and icap_log configuration directives
for this purpose.
Also currently the requests denied for logging using the log_access access list
will not be accounted for in performance counters.

This patch:
 - removes log_icap and log_access options from configuration file.
 - adds the "stats_collection" access list to control performane counters
   accounting.

This is a Measurement Factory project