Fixes #284 - Use MAC address if IP doesn't exist when tftp booting

• Uses any of the assoicated mac addresses (RH only) prior to IP
• Adds a new settings to not update mac or ip information to Foreman - used for cases
  where DHCP booting is done via a temporary dhcp range

Fixes #386 - Updated rake puppet:import_classes to support the new API

The rake task now queries for the changes and then performs the update.

Some additional sanity checking is performed in the execution phase.

A batch mode is provided via rake puppet:import:puppet_classes[true]. When...

Fixed an issue with metric processing on 0.25.x reports, refs #405

fixes #415 - Operating systems debian types were always shown

Added support for Debian-based distributions for automatically populating TFTP directory.

Fixes #178 and Fixes #24 - Automate populating the TFTP directory

This implementation is only for the Red Hat family, other OS's should follow
It implements a way to query foreman and gets the required boot files (i.e. kernel and initrd) files
from a predefine media over JSON....

fixes #414 - Do not store debug messages

Fixes #405 and Fixes #349 - Adds support to 2.6.x reports

NOTE: Its recommended to Backup your DB prior to using this patch.

updating EPEL rpm link for RHEL6

Operating system API should return allowed ptable, arch and media for this os