Apply other "get" rule of GET to image v1 client

[GET /resources] methods should be "list_<resource name>s"
or "show_<resource name>", so this patch applies the part
of the rule to image v1 client.

Partially implements blueprint consistent-service-method-names

Change-Id: I3440765c3117ec4022c470429008caf0d7464935
4 files changed