Fix the failing 2.1 site API fixture issue

[erran-r7]

I took the following steps to update this fixture. I actually had to use rm spec/fixtures/cassettes/basic_site.yml since a new session ID was required.

• Run the entire RSpec suite
  *Find and note any failures.
• Set fixtures to record
  On any fixtures which are failing either add the :once or :new_episodes method.
  NOTE: In some cases removing the fixture can be necessary to ensure your session token is new. This problem should probably be looked into...

         Nexpose::Site.new('test site name 1').tap do |site|
           site.description = 'test site description 1'

-          VCR.use_cassette('basic_site') do
+          VCR.use_cassette('basic_site', record: :new_episodes) do
             site.save(connection)
           end
         end

• Update to a live API environment
  • Set NEXPOSE_HOSTNAME to your Nexpose instance's hostname or IP address.
  • Set NEXPOSE_USERNAME to your Nexpose instance's username.
  • Set NEXPOSE_PASSWORD to your Nexpose instance's password.
• Re-run RSpec to overwrite the outdated test fixtures.
• Remove any fixtures that are no longer being used.

[gschneider-r7]

You can use site.included_addresses to be more concise than included_scan_targets[:addresses]

[erran-r7]

I see. I didn't look too heavily through the new gem docs. I'll convert to that now.

[erran-r7]

Done: 514f8e0