Created command line interface 'fuel_update_downloader'
for update downloading

This script will be delivered with iso.

Responsibility of the script:
* check if new update available
* check free space
* download and unpack update
* run fuel_upgrade script

Related to blueprint fuel-upgrade

Change-Id: Ib5f7566aed6fd1c1dc05ba96dd17cb75b4b9908b
Merge "Created command line interface 'fuel_update_downloader' for update downloading"