Catch volume errors during local delete

The delete code in compute/manager.py has a catch-all exception
handler for any volume related errors that occur during deletion.
This change brings the local_delete() method in compute/api.py
in line with that.

Fixes bug: 1224546

Change-Id: I399075f29d202355b28e7da1b2f1a29a66c86a4e
Merge "Catch volume errors during local delete"