Update packaging scripts

This consists of a set of changes allowing proper packaging for the
newer library version. These changes are:

- Use common scripts to deduce version information
- Remove man3 and cbcrc manpages from installation list
- Build with a static snappy on RPM platforms
- Debian platforms require a system-provided libsnappy
- Enhance debian script for paralell building

Change-Id: If9f6e973cd85d9bec6a3208e997bad93a04de62d
Reviewed-on: http://review.couchbase.org/38569
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>