pkg/kamailio/deb: clean lintian warnings

(cherry picked from commit c2a606c1b03b1014caa9053d64d43d09c4744d04)
pkg/kamailio/deb: fix init script

(cherry picked from commit 424ab9dd4abd9b11b7cf4642335652145128fa7c)
pkg/kamailio/deb: use freeradius-client lib on sid and jessie

(cherry picked from commit ba68be91bc206d27284cdaf9fb3ccc189fe33d4a)