Tweaks to the clamav policy

[David Hampton]

I've added support to the (unused) clamav policy to allow listening for
service requests on a TCP socket, and for interacting with amavis.  I
also made some tweaks that  tighten up the network access allowed by
freshclam, split the freshclam and spamd log files into two different
types, and make the clamd control socket a unique type.  Thanks.

David

P.S.  These diffs are based on the files from the selinux-policy-strict-
sources-1.22.1-2 rpm.