Pick up default EC2 region from boto.config

This doesn't account for boto configs where e.g. RDS has one
default region and EC2 another - all will default to `ec2_region_name`.

However, this is just handy to allow an easy site wide default
region if existing configuration already relies on it.

Modules can be improved to mention this in the documentation and
turn off required=True where needed. But it works with `ec2`
and `ec2_vol` without change.
Merge branch 'ec2_boto_config_region' of https://github.com/willthames/ansible into willthames-ec2_boto_config_region
Minor tweak to region config in boto configuration file
column must always be less than len(probline)

Fixes related to GH-5773.
Merge pull request #6199 from risaacson/issues_5773

column must always be less than len(probline)
Pass svn arguments as a list of strings instead of using string substition to ensure all parameters are escaped properly.
Added integration test for subversion parameters that need escaping.
output dest in error-message
Added instance_tenancy functionality per social request.
Merge pull request #6202 from muffl0n/unarchive_destdir

unarchive: output dest in error-message
Merge pull request #6201 from cchurch/devel

Escape subversion parameters for running svn commands
Merge pull request #6198 from jlaska/integration_ec2

First pass at ec2 module tests
Save the original transport in runner after detecting the smart transport

Fixes #6192
Always run cleanup after running cloud_integration tests