Add gateway_ip to nets DB table

	- Add gateway_ip column to net table at DB
        - Save and retrive gw ip during net creation and vm launching process

Change-Id: I93c5339aa61ded3631d34a90018bd67525b49ab1
Signed-off-by: mirabal <leonardo.mirabal@altran.com>
diff --git a/ovim.py b/ovim.py
index 0b252ee..286a4d0 100644
--- a/ovim.py
+++ b/ovim.py
@@ -396,7 +396,7 @@
             dhcp_host.ssh_connect()
         return dhcp_host
 
-    def launch_dhcp_server(self, vlan, first_ip, last_ip, cidr):
+    def launch_dhcp_server(self, vlan, first_ip, last_ip, cidr, gateway):
         """
         Launch a dhcpserver base on dnsmasq attached to the net base on vlan id across the the openvim computes
         :param vlan: vlan identifier
@@ -414,6 +414,6 @@
         controller_host = self.get_dhcp_controller()
         controller_host.create_linux_bridge(vlan)
         controller_host.create_dhcp_interfaces(vlan, first_ip, dhcp_netmask)
-        controller_host.launch_dhcp_server(vlan, ip_range, dhcp_netmask, dhcp_path)
+        controller_host.launch_dhcp_server(vlan, ip_range, dhcp_netmask, dhcp_path, gateway)