Swift recon introduced a new key for storage policies, and the CLI expected this
key in the server response. However, if one updates the CLI but not yet the
server an exception will be raised, because there is no default value and no
check if the key is included in the response.
This change checks if the policies key is included in the response and updates
one test to ensure backward compability.
Closes-Bug: 1453599
Change-Id: I7c7a90f9933bec2ab45595df9dc600a6cba65666