This object indicates how an IP address is obtained
to be associated with this virtual template.
The actual parameters of these methods are indicated
by the objects defined after.
none -- means no IP address associated.
ipAddress -- means an explicit IP address and mask.
interfaceIp -- uses the IP address of an interface
if it has one.
negotiate -- obtains IP address from a pre-configured
DHCP server.
In the set operation, only the parameter corresponding to
this object is considered. All other parameters are
ignored and forgotten.