Added API Commands in 4.2

Added API Commands in 4.2 addIpToNic Adds an IP address to the NIC from the guest subnet. The request parameters are: nicid, ipaddress. The response parameters are: nicid, ipaddress, networkid removeIpFromNic Removes the reserved IP for the NIC. The request parameters is: id. The response parameters are: true, false listNics Lists the NIC details of the user VM; the API response also contains the Secondary IP addresses of the NIC. The request parameters are: nicid, virtualmachineid. The response parameters are: id, ipaddress, secondaryips, gateway, netmask, macaddr, broadcasturi, isolationuri, isdefault,