delay fingerprinting of host

[lsato-r7]

MS-2073

• imports are slow mainly caused by fingerprinting after every service creation
• now only fingerprints after all the services are created for imports

OS Fingerprinting was making imports take a while if there were hosts with thousands of hosts. We were fingerprinting as a callback of service.rb and note.rb after every service and note creation. With the metasploit data model changes and these changes, for imports, we mark the workspace 'import_fingerprint' attribute as true not kicking off the callback to normalize the host. Imports that used to take 5 hours + now takes <10 minutes. Yay!

Verification

• make sure delay fingerprinting during imports metasploit_data_models#163 is merged in metasploit_data_models before continuing
• Start msfconsole
• grab a file to import
• verify db_import /path/to/file/to/import.xml passes
• verify the hosts imported are fingerprinted
• verify import still works in pro and hosts are fingerprinted

[acammack-r7]

Release Notes

This change delays the fingerprinting of imported hosts until after the end of an import, instead of fingerprinting them after every service is saved. The result is a drastic reduction of time importing hosts with many services.