Port hooks to the new format

Originally, we did not find a good terms for hook entities, so term "hook"
had several meanings: the plugin of action and the combination of
trigger+action configs.

While we are working on task format v2, we can make the things easier.

* rename plugin base Hook to HookAction;
* unification section "hooks" of task config format v2. Now, it
  looks similar to other sections.

Change-Id: Ic800fd4c9cb1ca19b7f6896e2994ca2e30f5138a

rally-jobs/self-rally.yaml

@@ -253,28 +253,25 @@
               times: 20
               concurrency: 2
           hooks:
-            - name: sys_call
-              description: Run script
-              args: sh rally-jobs/extra/hook_example_script.sh
+            - description: Run script
+              action:
+                sys_call: sh rally-jobs/extra/hook_example_script.sh
               trigger:
-                name: event
-                args:
+                event:
                   unit: iteration
                   at: [2, 5, 8, 13, 17]
-            - name: sys_call
-              description: Show time
-              args: date +%Y-%m-%dT%H:%M:%S
+            - description: Show time
+              action:
+                sys_call: date +%Y-%m-%dT%H:%M:%S
               trigger:
-                name: event
-                args:
+                event:
                   unit: time
                   at: [0, 2, 5, 6, 9]
-            - name: sys_call
-              description: Show system name
-              args: uname -a
+            - description: Show system name
+              action:
+                sys_call: uname -a
               trigger:
-                name: event
-                args:
+                event:
                   unit: iteration
                   at: [2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 17, 18]
           sla:
@@ -290,12 +287,11 @@
               times: 10
               concurrency: 2
           hooks:
-            - name: sys_call
-              description: test hook
-              args: /bin/true
+            - description: test hook
+              action:
+                sys_call: /bin/true
               trigger:
-                name: periodic
-                args:
+                periodic:
                   unit: iteration
                   step: 2
                   start: 4
@@ -312,12 +308,11 @@
             serial:
               times: 10
           hooks:
-            - name: sys_call
-              description: Get system name
-              args: uname -a
+            - description: Show system name
+              action:
+                sys_call: uname -a
               trigger:
-                name: event
-                args:
+                event:
                   unit: time
                   at: [0, 2, 4, 6, 8, 10]
           sla:
@@ -332,12 +327,11 @@
             serial:
               times: 10
           hooks:
-            - name: sys_call
-              description: test hook
-              args: /bin/true
+            - description: test hook
+              action:
+                sys_call: /bin/true
               trigger:
-                name: periodic
-                args:
+                periodic:
                   unit: time
                   step: 2
                   start: 0

tests/unit/plugins/openstack/hook/test_fault_injection.py

@@ -40,7 +40,8 @@ class FaultInjectionHookTestCase(test.TestCase):
               (dict(), False))
     @ddt.unpack
     def test_config_schema(self, config, valid):
-        results = hook.Hook.validate("fault_injection", None, None, config)
+        results = hook.HookAction.validate("fault_injection", None, None,
+                                           config)
         if valid:
             self.assertEqual([], results)
         else: