Respect region_name in nova_compute

Signed-off-by: Oleg Bulatov <oleg@bulatov.me>
Allow raw and script to support su
Document the `ec2` group.

This group is useful when using multiple inventory sources.
Ensure params were set in ec2_vpc before accessing them

Fixes #6763
Docker: don't send wrong parameters to client.start()

As part of being updated for the 1.10 API, a couple of parameters were passed to the docker.client.start() command that it doesn't accept. This caused the module to error out if it tried to start any Docker containers. This removes those parameters so the module works again.
Support hosts without private ip without errors

Not all Linode hosts have a private ip. This fixes an actual error that was happening because the generated list of private ips is empty when there isn't one.
Added Abiquo inventory plugin
apt_key lists all keys in uppercase

allow for a little user error
Add Docker inventory plugin
apt_key: fix key lookup for 64 bit key ids

Fixes #7018 by extending `all_keys` to work with either short or long keys.

Also removes the ununsed method `key_present`.
docker: send 1.10 params if docker-py is new enough version
docker: exclude 'entrypoint' from comparing 'command' param with containers

The JSON the Docker API returns includes the container's ENTRYPOINT value (if it has one) with the 'Command' value. So instead of checking if `container['Command'] == module.params['command']`, we just check that `container['Command'].endswith(module.params['command'])` so the entrypoint won't affect a container being properly classified as matching the module params or not.

Also I refactored a super-long `if` statement into some temporary variables - I did it to help me figure out what was going wrong, and then it makes the code more readable so I kept it.
Add an example to show all hostvars using debug

This is a useful example to help debug how facts and vars are being collated.
Merge pull request #7089 from dagwieers/debug-docs

Add an example to show all hostvars using debug
Update facts.py

Fixes #7093 --devel
Merge pull request #7099 from faust64/patch-2

Update facts.py
Large cleanups. Reintegrating all modules together for a guest
should now work with versions older than 8.4
ec2_eip integration tests.
Merge pull request #7108 from bcoca/freebsd_mtu_fix

should now work with versions older than 8.4