The logic of adding a partition number to the device path does not work
for devicemapper devices (e.g. a multipath storage device).
Conflicts:
ironic_python_agent/efi_utils.py
ironic_python_agent/tests/unit/extensions/test_image.py
ironic_python_agent/tests/unit/test_efi_utils.py
Change-Id: I9a445e847d282c50adfa4bad5e7136776861005d
(cherry picked from commit f09f6c9f1a)