Modify default interfaces to recognize VM guests

'interfaces' role will now use both 'ansible_virtualization_type' and
'ansible_virtualization_role' variables to select default interface
settings.

Default settings for OpenVZ Containers are also included (no interfaces
defined by default).
Enable FSCKFIX option in /etc/default/rcS
Add support for specifying required locales
Merge pull request #71 from drybjed/bugfixes

Various bugfixes and enhancements