Apply a naming rule of GET to compute clients(l*)

[GET /resources] methods should be "list_<resource name>s"
or "show_<resource name>", so this patch applies the rule
to compute clients which name is "limits".

Partially implements blueprint consistent-service-method-names

Change-Id: Ibe30d01057936cea68f38984064dff107cdcbe5c
3 files changed