VMware: update test file names

The tests files names all had prefix vmwareapi. This is no longer
needed as the test files are now under the vmwareapi directory.

The patch also fixed the permission for the file test_vm_util.py.

Change-Id: I87955a0a4d4d2b2c1dd55203658707ce7c6038f0
Merge "VMware: update test file names"