Add v1 client side owner based filtering

Add the --owner option to the v1 client's image-list command to support
filtering images based on the owner (tenant id).

Allows administrators to more easily list a particular user's images.

Note that this is far less efficient than v2 server-side owner based filtering.

Addresses bug 1201765.

Change-Id: I4ffa522b96c91e659c87f5452f2f1f44e47e806b
Allow v1 client to list all users' images

Add a '--all-tenants' option to the image-list command.  This adds
'is_public=None' to the query string passed to the server, and for an
admin user results in a listing of all images present on the server
irrespective of owner or public values.

Addresses bug 1201787.

Change-Id: I38dd0752a31ebea84f16b786d205e82eba1a96bc
Merge "Add v1 client side owner based filtering"
Merge "Allow v1 client to list all users' images"