Add "server" to action methods

As the qa-spec of consistent-service-method-names, basically all
methods’ names should be "<verb>_<resource/object name>".
So this patch adds the word "server" to compute action methods.

Partially implements blueprint consistent-service-method-names

Change-Id: Ib91dc75055b9e2331d243cac686fe19c7516f6ba
diff --git a/tempest/api/compute/admin/test_servers.py b/tempest/api/compute/admin/test_servers.py
index 1982eda..0528fa5 100644
--- a/tempest/api/compute/admin/test_servers.py
+++ b/tempest/api/compute/admin/test_servers.py
@@ -163,11 +163,11 @@
 
         # resetting vm state require admin privilege
         self.client.reset_state(self.s1_id, state='error')
-        rebuilt_server = self.non_admin_client.rebuild(
+        rebuilt_server = self.non_admin_client.rebuild_server(
             self.s1_id, self.image_ref_alt)
         self.addCleanup(waiters.wait_for_server_status, self.non_admin_client,
                         self.s1_id, 'ACTIVE')
-        self.addCleanup(self.non_admin_client.rebuild, self.s1_id,
+        self.addCleanup(self.non_admin_client.rebuild_server, self.s1_id,
                         self.image_ref)
 
         # Verify the properties in the initial response are correct