Remove old Baremetal Host Manager

Baremetal was deprecated in Juno and its driver was removed in
46ed619b9ab1d61582f36155eea0d4a88f31fd50

This cleans out the parts that's still left in the scheduler.

Change-Id: I86f583f7d0747a164dae4530e25f8b01c2144673
Merge "Remove old Baremetal Host Manager"