Add download_snapshots.py script to setuptools

Change-Id: Iff010ad65a0856f79177148616a27fabb0ffd06a
Signed-off-by: gaoxuesx <xuesongx.gao@intel.com>
Fix build failure and dependency bug.

There isn't python-pyquery in pypi only pyquery.

download_snapshots.py should be listed in spec file.

Change-Id: I6973e44ba038cda52f9f55d75022d30e8939a1ff