TT#157801 add working default config

A working stock config makes it possible to install this package and
have a working setup right away. Previously installing this package
fresh results in an error from systemd because the daemon refuses to
start due to lack of working config.

Change-Id: I470b4ec29a9aeea147a8d001b8e126611921c39e

debian/ngcp-rtpengine-daemon.install

@@ -1,3 +1,3 @@
 daemon/rtpengine /usr/sbin/
 debian/ngcp-rtpengine-iptables-setup /usr/sbin
-etc/rtpengine.sample.conf /etc/rtpengine/
+etc/rtpengine.conf /etc/rtpengine/

debian/ngcp-rtpengine-recording-daemon.install

@@ -1,3 +1,3 @@
 debian/ngcp-rtpengine-recording-nfs-setup /usr/sbin/
-etc/rtpengine-recording.sample.conf /etc/rtpengine/
+etc/rtpengine-recording.conf /etc/rtpengine/
 recording-daemon/rtpengine-recording /usr/sbin/