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

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

Partially implements blueprint consistent-service-method-names

Change-Id: I3fdfa1101b966015798a61aa6ba5acfdf4649831
diff --git a/tempest/services/compute/json/floating_ips_client.py b/tempest/services/compute/json/floating_ips_client.py
index f30bfdb..6095dc0 100644
--- a/tempest/services/compute/json/floating_ips_client.py
+++ b/tempest/services/compute/json/floating_ips_client.py
@@ -35,7 +35,7 @@
         self.validate_response(schema.list_floating_ips, resp, body)
         return service_client.ResponseBodyList(resp, body['floating_ips'])
 
-    def get_floating_ip_details(self, floating_ip_id):
+    def show_floating_ip(self, floating_ip_id):
         """Get the details of a floating IP."""
         url = "os-floating-ips/%s" % str(floating_ip_id)
         resp, body = self.get(url)
@@ -90,7 +90,7 @@
 
     def is_resource_deleted(self, id):
         try:
-            self.get_floating_ip_details(id)
+            self.show_floating_ip(id)
         except lib_exc.NotFound:
             return True
         return False