Renames *.rst files in /rally/doc/samples/tasks

Renames all .rst files in /rally/doc/samples/tasks
to README.rst.
And moves /rally/doc/samples/support to
/rally/doc/samples/tasks

Closes-bug: #1351599

Change-Id: I675266292bc1fbb62374ce0d12e6d06fbf7a8e3e

doc/samples/tasks/scenarios/vm/boot-runcommand-delete.json

@@ -11,7 +11,7 @@
                 "fixed_network": "private",
                 "floating_network": "public",
                 "use_floatingip": true,
-                "script": "doc/samples/support/instance_dd_test.sh",
+                "script": "doc/samples/tasks/support/instance_dd_test.sh",
                 "interpreter": "/bin/sh",
                 "username": "cirros"
             },

doc/samples/tasks/scenarios/vm/boot-runcommand-delete.yaml

@@ -9,7 +9,7 @@
         fixed_network: "private"
         floating_network: "public"
         use_floatingip: true
-        script: "doc/samples/support/instance_dd_test.sh"
+        script: "doc/samples/tasks/support/instance_dd_test.sh"
         interpreter: "/bin/sh"
         username: "cirros"
       runner:

rally/benchmark/scenarios/vm/vmtasks.py

@@ -64,7 +64,7 @@ class VMTasks(nova_utils.NovaScenario, vm_utils.VMScenario):
                  script's standard error stream.
 
 
-        Example Script in doc/samples/support/instance_dd_test.sh
+        Example Script in doc/samples/tasks/support/instance_dd_test.sh
         """
         server = None
         floating_ip = None