Fpb, add validation when user runs build command

* add jsonschema based validation
* changed creation process to make it simpler
  and more versioning friendly
* added MANIFEST.in because in setup.py it's
  impossible to specify directory with subdirectories
  to package the data files
* renamed package to fuel-plugin-builder,
  it's more conventional name for python
  eggs
* created an alias for `fpb` command `fuel-plugin-builder`

Implements: blueprint cinder-neutron-plugins-in-fuel
Change-Id: I76ba45d2176e84f6d12c2a65f563b43b1a415d79