This allows filtering out EC2 instances based on various different
filters including tags. As requested in 7480 it supports logical "OR"
instead of "AND" on the provided list of filters.

need to handle the case where include_pattern and exclude_pattern exist in the config file but contain empty strings

The provisioning module knows more about how nova deals with IP
addresses now. Ensure that the inventory module is similarly as smart
by separating out the logic into the openstack/module_utils.

fixed cache expiration

fixed vmware properties, was getting parent's properties
cache now actually works
removed tags, they were not the ones i was looking for
renamed cache defaults fixed ini file to match

- auth_system
- region_name

These are config settings that could be left out in many scenarios, but
the current code is requiring them. With this in place, I can get by
with this minimal .ini file:

```ini
[openstack]
version=1.1
auth_url=http://{keystone_host}:5000/v2.0
project_id=web
username={username}
api_key={password}
```

@mpdehaan said that nothing uses them at
https://github.com/ansible/ansible/pull/7988#issuecomment-47600006

azure - fix for: temporary redirect, not deleted vhds, missing locations and role types, async api calls

Signed-off-by: Hector Acosta <hector.acosta@gmail.com>

rules are avaialble at https://en.wikipedia.org/wiki/Wikipedia:AutoWikiBrowser/Typos

Document how to disable cache lookup with the ec2 inventory script

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.