modules/rtpproxy-ng: added setid_avp module param
	which can be used (instead of set_rtp_proxy_set function) to select
	used rtpproxy set
Remove unavailable pv_cache_get API

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
Fix missing int_str magic

Signed-off-by: Peter Lemenkov <lemenkov@gmail.com>
rtpproxy-ng: increase the receive buffer size to 64k