Use wizard to make package uploading clear

This patch divides package uploading in two steps:
file uploading and package parameters modification.

If the package is application category should be provided

Modify Package form also was updated to support that behavior

Implements blueprint divide-upload-package-into-two-steps
Change-Id: Ic4d7834db7bb6e431ab90dbb733d85d966384f4d
Merge "Use wizard to make package uploading clear"