Baremetal driver: remove unused states

NULL and INIT were not used since commit c20110d15be37948ddd9ef5f38001328aabf5b1d

Change-Id: I25c34872b100807d691e7e15f7b70be7ad1912b9
Handle NetworkAmbiguous error when booting a new instance with v3 api

Catch exception.NetworkAmbiguous error and map it to exc.HttpConflict when
using v3 api to create a new instance.

Change-Id: I18b6b9f0d8612a3757f6489dada41b5cd8eca758
Closes-Bug: 1350800
Merge "Baremetal driver: remove unused states"
Merge "Handle NetworkAmbiguous error when booting a new instance with v3 api"