Add a test that checks each individual script can be loaded in bare-mode.

Fixed most @load dependency issues in the process.  The test is still
failing in a "known" way due to hot.conn.bro and scan.bro.

Adressess #545

scripts/policy/frameworks/dpd/packet-segment-logging.bro

@@ -4,6 +4,8 @@
 ##! A caveat to logging packet data is that in some cases, the packet may
 ##! not be the packet that actually caused the protocol violation.
 
+@load base/frameworks/dpd/main
+
 module DPD;
 
 export {