Allow spaces in host names in the storwize driver

Storwize/SVC naming rules allow host objects to have spaces in their
names. The SSH injection filter will currently reject such names, and so
we surround the names with quotes. Please note that this doesn't allow
to have an arbitrary character in there except a space (anything else
will be cleaned up by the driver or rejected by the SSH injection filter
up the call chain).

Change-Id: If9aec40fe34293031f08d759dd930d73ead456f5
Closes-Bug: #1270204
Merge "Allow spaces in host names in the storwize driver"