Remove unused code

Bug Fix - fixed the choices typo got the ec2_asg module

Regexes were being parsed like ordinary ansible host patterns, so
square-bracket groups were getting interpolated wrongly.

Makes ansible fail if login_port is defined and login_host is either not...

Makes ansible fail if login_port is defined and login_host is either not defined, or defined as localhost. This is because if login_host is localhost then MySQLdb will use the socket instead of TCP. This leads to confusion for ansible users as, when a port is defined it gets ignored if login_host is localhost. This is to fix the bug reported by wrosario #8070. Info on MysqlDb can be read here http://mysql-python.sourceforge.net/MySQLdb.html

Add option to return all EC2/RDS instances regardless of state.

Merge branch 'resource-tag-required' of https://github.com/psa/ansible into psa-resource-tag-required

Fixes #6876

Provision VM using virtual network.

Some environments that utilize an SSL terminator with a self-signed
certificate can use the publicURL without getting certificate
verify errors.  This allows using the internalURL with in my case
is HTTP and not HTTPS.

Closes issue: #8057

Avoid resolving a pattern that is a plain host. When matching a hostname in the
hosts_cache, just use the host object from there.

When running a task on say 750 hosts, this yields a huge improvement.

Sample playbook when it may be useful:
```
- uri: return_content=yes url={{ api_base }}/action/{{ inventory_hostname }}
  register: output
- assert:
    msg: '{{ output.json | to_nice_json }}'
    that:
      - output.json.foo != "bar"
      - output.json.boo == 42
```

nova.py: Set defaults for OpenStack settings

Fix missing msg argument

Remove validation of RDS DB instance type names because Amazon frequently adds new ones