Install/download ssh keys from LDAP for consumption by SSH.

def install(self):  # pragma: no cover
        """Install/download ssh keys from LDAP for consumption by SSH."""
        keys = self.get_keys_from_ldap()
        for user, ssh_keys in keys.items():
            user_dir = API.__authorized_keys_path(user)
            if not os.path.isdir(user_dir):
                os.makedirs(user_dir)
            authorized_keys_file = os.path.join(user_dir, 'authorized_keys')
            with open(authorized_keys_file, 'w') as FILE:
                print("\n".join([k.decode() for k in ssh_keys]), file=FILE)