API Client

• Added CRUD functions for globally excluded targets.

Master

• Bumped fqdn library from 1.2.0 to 1.4.0 to fix a bug with numeric TLDs.
• Added GloballyExcludedTarget to track different globally excluded targets.
• Streamlined views in master/django_scantron/api/views.py with the permission_classes = (IsAuthenticated, IsAdminUser) line to prevent agents from even seeing the other API endpoints. Ensures the agents can only view the /api/scheduled_scans endpoint.
• Removed agent visibility of /results API endpoint.
• Explicitly identified which ScheduledScan fields are read only to prevent an agent from making updates to fields that it shouldn't, such as site_name, scan_agent, or targets against the /api/scheduled_scans endpoint.
• masscan --excludefile and -iL switches can only contain IP addresses. Added logic in master/scan_scheduler.py to remove non-IP addresses if the scan binary is masscan.