iks: enable locations swapping

+ enable swapping locations in locations manager
+ allow to swap location from location and protocol class
+ added new proxy location -- right now simple echo
+ hello command allows to switch to proxy after "hello <ID> proxy"
  command request
iks: functional proxy location

+ hello command now is able to switch to proxy location with:
   'hello ID proxy <ip> <port>'
+ proxy connects to client and forwards trafic from host to host
+ connecting to szbase now can be done with:
   'hello ID szbase <base>'