Update playbooks_roles.rst

Fixes https://github.com/ansible/ansible/issues/7241
Removing hard coded link and replacing with reference
python2.4 compatibility issue with urlparse
Added _meta hostvars key to gce.py plugin per the discussion in issue #9291.
Merge pull request #9329 from mcodd/devel

python2.4 compatibility issue with urlparse
Add --pretty option for gce inventory plugin
Add integration test for the shell module

* it ensures that it's possible to define options in the multiline block
Typo: greatful -> grateful
Add new class stubs
Move the v2 tests under the v2 tree
Add a README for the v2 unittests
Remove extraneous __init__ to fix v2 unittests
Somehow, git mv only rm'd test/v2 and didn't add v2/test
Remove temp file
Fix missing import
Fix relative imports
Starting to stub out some classes.
Stub out Inventory class - we're going to draw heavily on the existing
inventory for implementation
Add python3 compat boilerplate to executor
Add python3-compat boiler to all core files