Update for Storyboard

This project uses storyboard for new bugs, so fix a few places:

* Fix the "Report a bug" links so that bugs get reported against
  storyboard, not launchpad.
* Update CONTRIBUTING to link to storyboard.

Change-Id: I2760db2e14015407af46ec52ffe4883262ccb5ba

CONTRIBUTING.rst

@@ -11,6 +11,6 @@ the workflow documented at:
 
 Pull requests submitted through GitHub will be ignored.
 
-Bugs should be filed on Launchpad, not GitHub:
+Bugs should be filed on Storyboard, not GitHub:
 
-   https://bugs.launchpad.net/magnum
+   https://storyboard.openstack.org/#!/project/openstack/magnum

api-ref/source/conf.py

@@ -92,8 +92,7 @@ pygments_style = 'sphinx'
 
 # openstackdocstheme options
 repository_name = 'openstack/magnum'
-bug_project = 'magnum'
-bug_tag = 'api-ref'
+use_storyboard = True
 
 # -- Options for man page output ----------------------------------------------
 

doc/source/conf.py

@@ -31,8 +31,7 @@ extensions = [
 
 # openstackdocstheme options
 repository_name = 'openstack/magnum'
-bug_project = 'magnum'
-bug_tag = ''
+use_storyboard = True
 
 config_generator_config_file = '../../etc/magnum/magnum-config-generator.conf'
 sample_config_basename = '_static/magnum'

releasenotes/source/conf.py

@@ -46,8 +46,7 @@ extensions = [
 
 # openstackdocstheme options
 repository_name = 'openstack/magnum'
-bug_project = 'magnum'
-bug_tag = ''
+use_storyboard = True
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']