Monitor status of virtual systems in Check Point vsx/vsls cluster.

• creates one check for each virtual system.
• check goes critical if virtual system status is not 'Active' or 'Standby'
• long output gives details for each virtual system.
• monitors VSX virtual system counters (connections/packets/bytes/logs).
• supersedes checkpoint_vsx, checkpoint_vsx_connections, checkpoint_vsx_traffic, checkpoint_vsx_packets and checkpoint_vsx_status