Improve test_baremetal_basic_ops

- test_baremetal_basic_ops now can test scenarios
for partition/wholedisk images.
- added a new configuration for tempest `boot_mode`.
- if boot_mode is uefi the test_baremetal_basic_ops
will run a verification to make sure the VM is using
uefi.

Change-Id: I920675b8a61a65c850b245283c3613b03f33ee6a
2 files changed