Apply a naming rule of GET to telemetry client

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

Partially implements blueprint consistent-service-method-names

Change-Id: I9b5cabf1507c3ba5ad9538b5cd2ee2be5aa29939
2 files changed