fpb, shows incorrect message if task doesn't have timeout

[Evgeniy L]

Steps to reproduce:

1. create a plugin with the next tasks.yaml file

- role: ['controller']
  stage: post_deployment
  type: shell
  parameters:
    cmd: ./deploy.sh

2. run "fpb --check fuel_plugin_name"

Actual Result:

2014-11-25 19:27:18 ERROR 6514 (cli) Wrong value format "0 -> parameters", for file "fuel_plugin_name/tasks.yaml", {'cmd': './deploy.sh'} is not valid under any of the given schemas
Traceback (most recent call last):
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/cli.py", line 90, in main
    perform_action(args)
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/cli.py", line 80, in perform_action
    ValidatorManager(args.check).get_validator().validate()
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py", line 39, in validate
    self.check_schemas()
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py", line 46, in check_schemas
    self.validate_file_by_schema(v1.TASKS_SCHEMA, self.tasks_path)
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/validators/base.py", line 47, in validate_file_by_schema
    self.validate_schema(data, schema, path)
  File "/home/eli/job/fuel-plugins/fuel_plugin_builder/fuel_plugin_builder/validators/base.py", line 43, in validate_schema
    value_path, path, exc.message))
ValidationError: Wrong value format "0 -> parameters", for file "fuel_plugin_name/tasks.yaml", {'cmd': './deploy.sh'} is not valid under any of the given schemas

Expected result:
More readable message

fpb version - 1.0.1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/137149

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/137149
Committed: https://git.openstack.org/cgit/stackforge/fuel-plugins/commit/?id=f361ae87789a099f9cd612b1a66481f9e69ce250
Submitter: Jenkins
Branch: master

commit f361ae87789a099f9cd612b1a66481f9e69ce250
Author: Evgeniy L <email address hidden>
Date: Tue Nov 25 19:27:11 2014 +0400

    fpb shows incorrect message if task doesn't have timeout field

    * oneOf/anyOf statement in jsonschema provides hard to
      understand message, in order to solve this problem was created
      base jsonschema for parameters where timeout is required
      field
    * print error messages to stderr instead of stdout

    Closes-bug: #1396234
    Change-Id: I6dc6b8b77cdd4576a239303726ec42f69a1a0e73