ingroup is better than group especially on ?buntu

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7123 d0543943-73ff-0310-b7d9-9358b9ac24b2

debian/postinst

@@ -24,7 +24,7 @@ case "$1" in
 		if ! getent passwd freeswitch >/dev/null; then
 			adduser --disabled-password  --quiet --system \
 			--home /opt/freeswitch \
-			--gecos "FreeSwitch Voice Platform" --group daemon \
+			--gecos "FreeSwitch Voice Platform" --ingroup daemon \
 			freeswitch
 		fi