Add encrypt_file and decrypt_file utility functions. We will use them to encrypt the replica file so that we can transport it over more safely. It contains sensitive data, by encrypting it we assure that even if a distracted admin leaves it around it cannot be accessed without knowing the access passphrase (usually the Directory Manager password)
    
    Along the way fix also ipautil.run which was buggy and not passing
    in correctly stdin.
    
    Add dependency for gnupg in spec file