Added missed QoS and buffer configurations for ACS-MSN2740 (sonic-net#275)

Author: AndriiS

debian/swss.install

@@ -2,5 +2,7 @@ swssconfig/sample/netbouncer.json etc/swss/config.d
 swssconfig/sample/00-copp.config.json etc/swss/config.d
 swssconfig/sample/msn2700.32ports.buffers.json etc/swss/config.d
 swssconfig/sample/msn2700.32ports.qos.json etc/swss/config.d
+swssconfig/sample/msn2740.32ports.buffers.json etc/swss/config.d
+swssconfig/sample/msn2740.32ports.qos.json etc/swss/config.d
 swssconfig/sample/td2.32ports.buffers.json etc/swss/config.d
 swssconfig/sample/td2.32ports.qos.json etc/swss/config.d