Updates for the Intel Framework.

- Intel importing format has changed (refer to docs).

 - All string matching is now case insensitive.

 - SMTP intel script has been updated to extract email
   addresses correctly.

 - Small fix sneaking into the smtp base script to actually
   extract individual email addresses in the To: field
   correctly.

scripts/policy/frameworks/intel/http-host-header.bro

@@ -4,8 +4,8 @@
 event http_header(c: connection, is_orig: bool, name: string, value: string)
 	{
 	if ( is_orig && name == "HOST" )
-		Intel::seen([$str=value,
-		             $str_type=Intel::DOMAIN,
+		Intel::seen([$indicator=value,
+		             $indicator_type=Intel::DOMAIN,
 		             $conn=c,
 		             $where=HTTP::IN_HOST_HEADER]);
 	}