Add DHCP functionalities to hypervisor eth interfaces

This commit adds methods that provides dhcp functionalities on
the ethernet interface like - disable dhcp on an ethernet interface,
to check if dhcp is enabled on an interface.

Signed-off-by: Asmitha Karunanithi <asmitk01@in.ibm.com>
Change-Id: Ic713782d48c4c3cc1e1d029212b3ecf7ff5f39ad
2 files changed