packaging: Move passwd encryption script to tools

This script used to be in the PKI directory, but it is a tool used
outside of the PKI environment, so it is better placed in the bin
directory and owned by the tools package.

Change-Id: Ie0732b58043925d7931daa53b51d90310a6964f2
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>