Fixes to some corner cases + support for some missing 'options and

attributes' for backward compatibility

Ticket: CM-1438
Reviewed By:
Testing Done: Tested ifupdown sanity and new functionality

support for:
- -i <interface file>
- template lookup path and move all template handling to a separate
  module template.py
- new ifupdown2 config file /etc/network/ifupdown2/ifupdown2.conf
- bridge_waitport and bridge_maxwait
- moved addons.conf to /var/lib/ifupdownaddons/

setup.py

@@ -16,6 +16,8 @@ setup(name='ifupdown2',
                   ('/etc/init.d/',
                       ['init.d/networking']),
                   ('/sbin/', ['sbin/ifupdown']),
+                  ('/etc/network/ifupdown2/',
+                      ['config/ifupdown2.conf', 'config/templates']),
                   ('/usr/share/doc/ifupdown/examples/',
                       ['docs/examples/interfaces'])]
       )