fix dhcp lease entry wrong hostname (apache#4064)

When Guest VM add secondary nic,  will get wrong hostname "infiniteh" from dhcp server
infiniteh -->infinite
cat /etc/dhcphosts.txt
02:00:0b:ef:00:04,set:192_168_4_18,192.168.4.18,gumd-tes3,infiniteh

Author: havengit

systemvm/debian/opt/cloud/bin/cs/CsDhcp.py

@@ -188,7 +188,7 @@ def add(self, entry):
                                             lease))
         else:
             tag = entry['ipv4_address'].replace(".", "_")
-            self.cloud.add("%s,set:%s,%s,%s,%sh" % (entry['mac_address'],
+            self.cloud.add("%s,set:%s,%s,%s,%s" % (entry['mac_address'],
                                                     tag,
                                                     entry['ipv4_address'],
                                                     entry['host_name'],