Test nonexistent volume type extra_spec name instead of id

volume type extra_spec doesn't work with 'id', so this is to
rename test_get_nonexistent_extra_spec_id to
test_get_nonexistent_extra_spec_name, testing nonexistent
volume type extra_spec.

Change-Id: I67e22a821eb88cbf3f9e03bfefc592456b79bb0c
1 file changed