Fixing typo in EC2 modules

The issue was that, when forks == 1, the _executor() function was
being called with None for the value of new_stdin.

Fixes #3841, #3902

Minor cleanup of CHANGELOG for 1.3

Fixes #2897

Also removing the ControlPath option, as it will now be auto-generated
if the ControlPersist option is set in the arguments.

Addresses CVE-2013-4260: predictable filename used for failed results
in world writable directory.

Files were being created in /tmp, but will now be created in $HOME/.ansible/cp/
Addresses CVE-2013-4259: ansible uses a socket with predictable filename in /tmp

fixes ansible/ansible#3609 Add max_fail_pct to playbook parameter, to complement serial option, So if total number of failures execeed max_fail_pct * total number of hosts, do not go to the next serial batch

docsite typos

This extends ansible-pull so that it can support using other
source_control modules for checking out a playbook repository
(issue #3372).  This will check to see if the module exists before
it attempts to do the checkout and will exit if the module is not found.
It requires that the module used to check out the repository support the
parameters 'name' and 'version'.  The option -C, --checkout is now
optional and defaults to the module's default behavior for selecting a
branch, tag, or commit value.  For git, this continues to be HEAD.

Other changes include:
* Remove git from help and use generic term(s) where needed.
* Use SortedOptParser from ansible.utils
* More abstraction of common options used between ansible and
  ansible-playbook.

For issue #3372, apply consistent parameter aliases to source_control
modules.  For hg, add name and version and add to documentation string.
For subversion, add version and document version and name aliases in
documentation string.

just darting a mistyped "ansible"

perhaps there may be pip distribution using "pip-install" but "pip install" is universal afaik

Tests `test_playbook_undefined_varsX_fail` check if ansible detects
undefined variables when `error_on_undefined_vars` is enabled. These
tests fail without "Improve behavior with error_on_undefined_vars
enabled" patch.

Tests `test_playbook_undefined_varsX_ignore` check if ansible ignores
undefined variables when `error_on_undefined_vars` is disabled.

Also modify PlayBook._run_task_internal() so error_on_undefined_vars is
testable.

Pass fail_on_undefined flag to recursive calls to `template` function,
so more undefined variables are detected.

Works only for Jinja style variables. Undefined legacy variables are
never detected.

For link-local addresses, it is sometimes necessary to append the
interface to use for the ipv6 address. This patch extends the ipv6
regex to allow for '%ifnameX' at the end.

See https://bugzilla.redhat.com/show_bug.cgi?id=136852 for more info

and ipv6 addresses.

Due to various inconsistencies of ssh and sftp regarding ipv6 and
ipv4 handling, some special arguments must be passed, and the
ipv6 must be passed in a specific format.

testing with a ipv6 :
  ansible -u misc -i  '[2002::c23e]:22,' '*' -m ping

fail due to parsing of ':' as a separator of port/ip with ipv4.
This commit add support for properly parsing 2002::c23 and the
bracket notation [2002::ce]:2222

image_id is not required to delete a vm from openstack

Fixed tiny bug with _meta handling in external inventory scripts