version 0.6.50

• firewall: do not assign default zone, but pass as is (bsc#1109147)
• man: fix some typos
• fix several leaks in wickedd-nanny (bsc#1095818) and improve memory handling in several commits detailed below.
  • fsm: cleanup worker reset (reinit) vs. free
  • fsm: do not process or pass pending workers to nanny
  • nanny: catch init failures in device registration
  • netdev: allow NULL in get and put functions
  • model: fix to call (netif) dbus object destructors
  • model: removed server specific call in netif destroy
  • fsm: handle NULL in worker get and release calls
  • fsm: process device delete event separately
  • calls: split get netif service and netif list utils
  • xml-schema: fix range constraint values parsing
  • xml-schema: remove underscores from ni_xs_type_new
  • xml-schema: fix type leak around ni_xs_build_one_type
  • fsm: free worker control mode on worker free
  • xpath: trace and free complete xpath expression tree
  • nanny: fix config leak in ni_nanny_recheck_policy
  • dbus: free pending call in ni_dbus_connection_call
  • dbus: free dbus_message_iter_get_signature result