license
updated opensips test framework
test/freeswitch cleanup
registrant out of pkg_mem
Updated dependencies.

OpenSIPS 1.11.0 (pre) has fixes for registrant memleak + the mi_json module.
Added notes on setting up `dumpcap` for traces.
opensips: special_drouting in production
Initial fixes for opensips 1.11
opensips: proper doc for register-registrar
opensips: initial code for `register_check_ip`
opensips: document Parameters in fragments.
opensips: normalize script events names.
doc/opensips: do not document (private) templates `emergency` and `registrant`.

Those are used internally by `applications/emergency` and `applications/registrant`.
opensips: `notify_via_rabbitmq`