Update the bootstrap script to the latest stable release v2014.10.21

* Fix path to python on FreeBSD. Thanks Pavel Snagovsky(@paha)
* Fix syndic installation on RHEL based installations. Thanks @markgaylard.
* Properly detect the git checkout `basename` directory instead of hard coding it. Thanks Howard Mei(@HowardMei).
* Allow installing ZMQ for SaltStack's COPR repository.
* Allow installing ZMQ4/PyZMQ14 from Chris Lea's PPA repository.