TT#23358 Move db_redis table descriptor in /etc/kamailio folder

In postinst file add commands to move db_redis table descriptor
in /etc/kamailio folder in oreder to be oevrwritten using ngcpcfg
framework

Change-Id: Id855946b59f65ca36c011949db3dfd01556530da
(cherry picked from commit 1192c499ca)

debian/ngcp-kamailio.postinst

@@ -11,6 +11,17 @@ case "$1" in
                 --shell /bin/false --gecos "Kamailio" \
                 --home "$HOMEDIR" kamailio || true
 
+        # Move kamailio db_redis table descriptors onder /etc/kamailio/db_redis folder
+        # in order to easily modify it using ngcpcfg templates
+        if [ -d /usr/share/kamailio/db_redis ] && [ -d /etc/kamailio/ ]; then
+          
+          # Copy kamailio original content in the target folder
+          mv /usr/share/kamailio/db_redis /etc/kamailio/
+
+          # Create symlink 
+          ln -sf /etc/kamailio/db_redis /usr/share/kamailio/db_redis
+        fi
+
         # Remove obsolete rc.d links.
         update-rc.d kamailio-lb remove
         update-rc.d kamailio-proxy remove