[#586] Skip port when matching listen domains

We may have a situation where the domain
can be specified in the config without a
port, and the host in the header will be
with a port. As a result, the host will
not match. Now the port is not taken into
account when checking for a match.

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

cmd/s3-gw/validate_test.go

@@ -21,6 +21,8 @@ func TestValidateDomains(t *testing.T) {
 		"s3dev.fro<stfs.devenv",
 		"<wildcard>.dev.<wildcard>.frostfs.devenv",
 		"<wildcard>.dev.<wildc>ard>.frostfs.devenv",
+		"s3dev.frostfs.devenv:8888",
+		"<wildcard>.frostfs.devenv:443",
 	}
 	expectedDomains := []string{
 		"s3dev.frostfs.devenv",