Fix error handling on missing dest with unarchive

fixes #7107
Used module_args passed to function instead of from runner
Docker client occasionally returns a NoneType, so we have to catch the TypeError
Removing zone choices that overly-limit available zones for gce

Fixes #7270
Fixing two bugs in the ec2_elb_lb module

* the current state of the ELB was not reflected properly when checking
  the status after a change was made.
* invalid zones caused a traceback when enabling/disabling zones
ignore remnants from doing a setup.py install
Make sure amazon test doesn't check host keys
Update packaging dates for the 1.6.0 release
Updating changlog and releases for 1.6
Version bump for 1.7
Update RELEASES.txt
Update CHANGELOG.md
made enabled/disabled checks of apache2_module workable
Fix sync_binlog name in mysql_variables example

The previous sync_binary_log is not a real MySQL variable.
Make sure distro variable is set if python-apt is installed

Fixes #7295
[get_url] check against lowered stripped sha256sum

The content of the sha256sum attribute should be lowered before comparing it with the calculated sha256sum.

In the following example the used sha256sum uses ABC.. and not abc.. and the check failed. This should not happen.

```
TASK: [get_url url=http://ftp.fau.de/apache/hadoop/common/hadoop-2.4.0/hadoop-2.4.0.tar.gz dest=/home/vagrant/hadoop-2.4.0.tar.gz mode=0644 sha256sum=024326AC68A1A68B5566B10F95609EAAFD9F70CFEB37FCA0E97CBB1674E57C3A] ***
failed: [instance000] => {"failed": true}
msg: The SHA-256 checksum for /home/vagrant/hadoop-2.4.0.tar.gz did not match 024326AC68A1A68B5566B10F95609EAAFD9F70CFEB37FCA0E97CBB1674E57C3A; it was 024326ac68a1a68b5566b10f95609eaafd9f70cfeb37fca0e97cbb1674e57c3a.

FATAL: all hosts have already failed -- aborting
```
[test_apt_repository] Verify that 'python-apt' auto-installs correctly

Remove 'python-apt' before testing the 'apt_repository' module.  The
'apt_repository' module has the smarts to auto-install python-apt.  The
integration test will now assert the correct auto-install behavior.
Close fds when running commands from the accelerate daemon

Fixes #7307
Add integration tests for group_by module. Fixed bug introduced by ansible/ansible#7273 while also fixing issue described in ansible/ansible#6953
Add pyc/pyo to ignore list for inventory directories

Fixes #7308