Install files to correct location for RPM
Install files to correct location for RPM

For RPM packages, install the files to 'site-packages' instead
of 'dist-packages'.

Change-Id: I3e7d44c9c0cf6229e9391c5e0c123ac3db59e7f4
Fixes: MNA-23

midonet/python-neutron-plugin-midonet,JoeMido/networking-midonet,midonet/python-neutron-plugin-midonet,JoeMido/networking-midonet,yamt/networking-midonet,yamt/networking-midonet