VMware: move file name handling to utility methods

[Tracy Jones]

It's tempting to use os.path to create proper file names in nova-compute. However for the vmware driver this breaks if nova-compute is run on windows. We should use utility methods to create the filename/path so that people don't need to know to not to use os.path.

Another option is to use os_posix.path()

[Tracy Jones (tjones-i)]

for example -

import posixpath
posixpath.join('a', 'b')

[Tracy Jones (tjones-i)]

Kai - can you consider fixing this so that it is clear when an ESX path is needed vs a Nova path?

i.e.

esxPath(...)

vs

novaPath(...)

[Markus Zoeller (markus_z) (mzoeller)]

Will work on this during the OpenStack upstream training of the summit.

[Gary Kotton (garyk)]

This has been addressed in the oslo vmware library.