Make IPAM more pythonic

Make IPAM more pythonic

__init__.py is usually an empty file, or contains platform specific
code to make the package function. One more use is to have __init__.py
contain import statements, to import functions and classes, for convenience.

http://docs.python-guide.org/en/latest/writing/structure/#packages
http://mikegrouchy.com/blog/2012/05/be-pythonic-__init__py.html

Change-Id: I7408ac95f4970fbd7009257dfb698102ffabb6e3