meta-google: dhcp-done: Adding status report

Previously dhcp-done only sends status code, this one provides the
capability to send status code + status message for better
troubleshooting.
Provide a

meta-google: dhcp-done: Adding status report

Previously dhcp-done only sends status code, this one provides the
capability to send status code + status message for better
troubleshooting.
Provide a way to let other process upgrade the status.

Tested: Unit test passed.

Change-Id: I9c689f90502a32b586c41e3491ad47ebc78fcc38
Signed-off-by: Yuxiao Zhang <yuxiaozhang@google.com>

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