unify the crypto policies used by different applications and libraries

 "crypto-policies" is a utility to unify the crypto policies used by different
 applications and libraries. The current implementations works by setting the
 desired policy in /etc/crypto-policies/config. After this file is changed
 the script 'update-crypto-policies' should be executed, and the new policies
 will activate.
 .
 The supported back ends are:
  - GnuTLS
  - OpenSSL
  - NSS
  - BIND9
  - libkrb5
  - OpenSSH
  - Java (OpenJDK)
  - libssh
  - libreswan