Change the acl syntax slightly: the ( ... ) should enclose all of

Change the acl syntax slightly:  the ( ... ) should enclose all of
the rule (ie: also !  and /mask if present).

Implement matching for IPv4.

Acl tests are shmlogged as follows (doc candidate):

	shmlog tag:	VCL_actl

	"NO_MATCH $acl"
		client did not match access list $acl
	"FAIL $acl $rule"
		getaddrinfo(3) failed on $rule which had a '!'
	"MATCH $acl $rule"
		client matched $rule
	"NEG_MATCH $acl $rule"
		client matched negated (!) $rule

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@558 d4fa192b-c00b-0410-8231-f00ffab90ce4