Image cache aware weigher for OpenStack Compute (nova)

Currently OpenStack scheduler does not take into account the cached images in the compute nodes. If we take into account the cached images when making scheduling decisions we may decrease the data transfer from Glance into the compute nodes, resulting in a shorter start time.

Homogenize CLI commands for python-novaclient

Currently we have several commands doing similar things that are constructed in a different way. For example flavor-show image-show aggregate-details fixed-ip-get Conceptually are the same (i.e. they retrieve information from something), but they are constructe in a different way. We should homogen...