fixed main() issue created in prev fix, now values are empty string if they were None

Signed-off-by: Brian Coca <briancoca+ansible@gmail.com>
ec2.py: Make sure ec2_placement gets handled correctly

ec2_placement was missing from the inventory variables ec2.py was
producing.  Make sure that gets properly included rather than ignored.
small change to docs
small change to docs
Add exact_count and count_tag to the ec2 module.
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 pull request #5900 from Afterburn/devel

Confirmed that these are small changes to the docs that help with the clarity.
Update docstrings
Make an example that sets the instance Names
Merge pull request #5901 from jctanner/ec2_tag_exact_count_2

Add exact_count and count_tag to the ec2 module.
Update changelog for ec2 exact_count and count_tag
Added port documentation to postgresql_db and postgresql_user
Merge pull request #5826 from romeotheriault/fix_follow_redirects

A fix for uri module regarding following redirects. The old behavior would follow redirects either way. This change clarifies the functionality and makes it a bit more explicit. Comparing the old behavior to the new 'yes' == 'all', 'no' == 'safe' and now 'no' will not follow any redirects. Historic behavior is still supported and documented with a push to the new values.
Return a tagged_instances list for hosts that matched the count_tag
Check mutually_exclusive parameters before applying defaults
Make ec2 exact_count and count mutually exclusive
Support for -a to accept a file with test-module

If the CLI value for -a starts with an @, treat it like a file, and dump the contents into complex_args

This supports yaml or json.
Merge pull request #5906 from sivel/test-module-json

Support for -a to accept a file with test-module
Merge pull request #5885 from risaacson/issue5739_4

Addresses #5739 and cleans up copy.py
Merge pull request #5905 from artursvonda/update-postgresql-docs

Added port documentation to postgresql_db and postgresql_user.