New packaging method

The new ./package.sh script provides all necessary functionality to
produce packages without having version numbers in version-controlled
files.

The debian changelog, and rhel copyright files are now removed and auto
generate as build products into build/, which is added to the ignore
file.

./package.sh deb 1.2.0
./package.sh rhel 1.2.0 0-1 would do the same, for rhel.

Signed-off-by: Galo Navarro <galo@midokura.com>