Fix grammar and value errors in cron documentation

Previously we assumed the shell on the target systems were 'sh'-
compliant when formatting environment variables preceding command
strings. This patch corrects that by basing the target shell type
on the DEFAULT_EXECUTABLE setting, which can be overridden on a
per-host basis using the inventory variable 'ansible_shell_type'.

Fixes #7352

Add documentation for required parameter name to quantum_subnet

Fix: Remove check for Ghost state

This fixed the just committed change handling non existent Ghost state.

Remove check for Ghost state

This doesn't exist anymore and causes ansible to throw a KeyError

rds module: Fix undeclared reference to "params" when setting password in modify mode

Make alternatives module python 2.5 compatible

modify mode.

module docker - add docker version comment

Fix #7057 missing False default for vars_prompt

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.

cloud/rds : renaming an rds instance always fails

Merge branch 'docker_image-patch-notag' of https://github.com/orgoj/ansible into orgoj-docker_image-patch-notag

Merge branch 'git-submodule-when-recursive-true' of https://github.com/bibliotechy/ansible into bibliotechy-git-submodule-when-recursive-true

module replace - report changed only if contents is changed