Rename certification/ to tasks/

Every day Rally step by step closer to the point where Rally is going to be
generic framework and it would be possible to split Rally & Rally OpenStack Plugins

One of the blockers for doing this is certification & samples directories and
their contents. Current apporach creates a lot of confusion:

- Rally Users are running samples against production
- Rally samples are actually not that usefull, because creating from them
  tasks takes a lot of time
- Rally Users don't know what certification task is and how to use it
- Samples are hard to ship/find in packaged way (when rally is installed)
- Samples are going to be impossible to ship after the split
- We have to keep hunderds of yaml/json files in actual state
  in our repo (extra work for developers)

Proposed approach is to:

- Create mechansim CLI command that generates samples using plugin names
- Rename certification -> tasks
- Put in tasks directory pre created and tested tasks for different use cases:
  key performance metrics, functional testing, load testing of key functionality,
  ha Testing
- Remove samples as they are not needed anymore

Change-Id: I4c45224c3af637d17dab0edea038c69a2bae8b1a

Dockerfile

@@ -14,7 +14,7 @@ RUN echo '[ ! -z "$TERM" -a -r /etc/motd ] && cat /etc/motd' \
             >> /etc/bash.bashrc; echo '\
 ╔═════════════════════════════════════════════════════════════════════════════╗\n\
 ║ Welcome to Rally Docker container!                                          ║\n\
-║  Rally certification tasks, samples and docs are located at ~/source/       ║\n\
+║  Rally pre created tasks, samples and docs are located at ~/source/         ║\n\
 ║  Rally configuration and DB are in ~/.rally/                                ║\n\
 ║  Rally at readthedocs - http://rally.readthedocs.org                        ║\n\
 ║  How to contribute - http://rally.readthedocs.org/en/latest/contribute.html ║\n\

doc/source/install_and_upgrade/install.rst

@@ -135,7 +135,7 @@ be done via the following steps:
    likely to work if your home directory has excessively open
    permissions (e.g., ``0755``), which is not recommended.
 
-You can find all task samples, docs and certification tasks at /opt/rally/.
+You can find all task samples, docs and pre created tasks at /opt/rally/.
 Also you may want to save the last command as an alias:
 
 .. code-block:: bash

tasks/README.rst

@@ -0,0 +1,6 @@
+================================
+Rally Tasks For Production Usage
+================================
+
+
+Detailed Instruction TBD

tests/ci/hooks/certification_post_test_hook.sh

@@ -5,7 +5,7 @@ source $SCRIPT_DIR/../rally_gate_functions.sh
 
 setUp
 
-TASK=$RALLY_DIR/certification/openstack/task.yaml
+TASK=$RALLY_DIR/tasks/openstack/task.yaml
 TASK_ARGS=$RALLY_DIR/rally-jobs/certifcation_task_args.yaml
 
 TASK_ARGS="--task-args-file $TASK_ARGS"

tests/functional/test_certification_task.py

@@ -21,13 +21,13 @@ import unittest
 from tests.functional import utils
 
 
-class TestCertificationTask(unittest.TestCase):
+class TestPreCreatedTasks(unittest.TestCase):
 
     def test_task_samples_is_valid(self):
         rally = utils.Rally()
         full_path = os.path.join(
             os.path.dirname(__file__), os.pardir, os.pardir,
-            "certification", "openstack")
+            "tasks", "openstack")
         task_path = os.path.join(full_path, "task.yaml")
         args_path = os.path.join(full_path, "task_arguments.yaml")