Fix #7057 missing False default for vars_prompt

The test for default should be "is not None" since a boolean value of
False is a valid value.

See discussion at:
  https://groups.google.com/forum/#!topic/ansible-project/oc1_zE-FnyI
module docker - add docker version comment

Default docker version 0.9.1 from Ubuntu 14.04 LTS don't report APIVersion.
Ensure the validation string has %s in it
Make alternatives module python 5 compatible
ec2: Fix bug with running/stopped state and wait=yes.

If `get_all_instances` returns multiple reservations, the old wait loop only
dealt with the first reservation. Thus, the wait loop may end before all
instances get to be running/stopped.

Also clean up the code a little.
Merge branch 'ec2-start-stop' of https://github.com/sayap/ansible into sayap-ec2-start-stop
Merge branch 'sayap-ec2-start-stop' into devel
Fixing a doc mistake in the ec2 module from 4269bb6
Merge pull request #7058 from jkleckner/fix-vars_prompt-when-default-False

Fix #7057 missing False default for vars_prompt
Merge branch 'devel' of https://github.com/jjshoe/ansible into jjshoe-devel
Merge branch 'jjshoe-devel' into devel
Merge pull request #7110 from orgoj/docker-patch-version_comment

module docker - add docker version comment
rds module: Fix undeclared reference to "params" when setting password in
modify mode.
Assert the MOCK_CFG exists for the mock-rpm build target
Merge pull request #7343 from lberruti/alternatives_python5_2

Make alternatives module python 2.5 compatible
Add documentation for required parameter name to quantum_subnet
Merge pull request #7342 from herbygillot/rds-params-fix

rds module: Fix undeclared reference to "params" when setting password in modify mode
Fix grammar and value errors in cron documentation
Remove check for Ghost state

This doesn't exist anymore and causes ansible to throw a KeyError
Adding an integration test for variable precedence