Apply a naming rule of GET to orchestration client

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

Partially implements blueprint consistent-service-method-names

Change-Id: I5a0d046d3811d48d3e4bddae8b0f022762c621c8
8 files changed