DCMI: Add  get/set Configuration Parameters command

1.Systemd-networkd doesn't allow to configure DHCP timings, so set is
not implemented.
2.Get command to DHCP timings will return hardcoded values from
systemd-networkd source code.
3.Systemd-networkd doesn't support Random Back off, so not implemented.
4.As the info about VendorClassIdentifier is not clear in the spec,
Right now we are not supporting DHCP Option 60 and Option 43. We will
open new issue for it.

Resolves openbmc/openbmc#2752

Change-Id: I2682e5e43ceb19647e5240b095f601777213530b
Signed-off-by: Nagaraju Goruganti <ngorugan@in.ibm.com>
2 files changed