Pycons3rt

=====

* Updated pycons3rt to lo longer change directories to the
log directory, and fixed the 'pycons3rt_setup' CLI command

=====

* Moved the save_iptables method from aliasip.py to bash.py
* Cleaned up aliasip.py

=====

* Updated add_nat_rule to use the ip_addr function which works
better across Linux distributions
* Added re-try logic to the AWS meta data service is_aws method
to handle cases after system reboots

=====

* Added the ability to skip files with specific extensions to
create the asset zip file
* Removed cons3rtutil.py, it is not useful to anybody
* Added exception handling around posting a Slack message
* Added exception handling for a ConnectionError around querying Nexus
* Removed warning suppression for Python 2.6 from nexus.py

=====

* Added asset.py with methods to validate an asset structure and
creates an asset zip file
* Added an asset CLI to create asset zip files and validate asset
directories. To use: "asset create --asset_dir=/path/to/asset/"

=====

* Initial packagable version installable by pip