VMWare: bug fix for Vim exception handling

The exception handling in the Vim module was too broad and did not treat
the suds.MethodNotFound exception. This would result in a exception
that "__deepcopy__" is not supported in the VIM module.

In the case of an exception the VMwareAPISession class may be deleted.
The patch also ensures that the deletion is able to logout if necessary.

Closes-bug: #1228847

(cherry picked from commit be5d39eacc84c11f96357a624ffa1cdeda8a568d)

Conflicts:

	nova/tests/virt/vmwareapi/test_vmwareapi.py

Change-Id: Ic85be9b3407c444db4b3a074108c01d9141c61be
Merge "VMWare: bug fix for Vim exception handling" into stable/havana