Add logging to the ifcfg provider.
Add logging to the eni provider.
Add -d and -v options for logging level control

Adds -d (--debug) and -v (--verbose) options to control
the log levels.
Add logging to utils.
Don't write 'None' to ifcfg route files.

Corrects an issue where 'None' got written into the
ifcfg format route files instead of ''.
Add README example docs, etc.
Uncomment the provider.apply call

This fixes issues where running os-net-config did nothing.
WIP: iproute2 tools implementation

uses 'ip', 'ovs-vsctl' and 'vconfig'. Tests incomplete