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: Iafde9090b17dcc3ddf56de6b5117806870eeb855
Signed-off-by: Juan Hernandez <juan.hernandez@redhat.com>
(cherry picked from commit cdab98683d8e5eb63a58fc7ca4d92b7ce2b1937f)