docker: Add packages to used by ca-certificates_debian.bb

[teradat]

Purpose of pull request

Add package installation of python3-cryptography module used by meta-debian's ca-certificates_debian.bb.

Test

How to test

1. Build and run the Docker container

   $ ./repos/meta-emlinux/docker/run.sh build
   $ ./repos/meta-emlinux/docker/run.sh
   

2. Check installed cryptography module

   Start the Python 3 interpreter.

   $ python3
   

   Check cryptography module.

   >>> help('cryptography')
   

Test result

The cryptography module is installed.

>>> help('cryptography')
Help on package cryptography:

NAME
    cryptography

DESCRIPTION
    # This file is dual licensed under the terms of the Apache License, Version
    # 2.0, and the BSD License. See the LICENSE file in the root of this repository
    # for complete details.

PACKAGE CONTENTS
    __about__
    exceptions
    fernet
    hazmat (package)
    utils
    x509 (package)

DATA
    __all__ = ['__title__', '__summary__', '__uri__', '__version__', '__au...
    __copyright__ = 'Copyright 2013-2019 The cryptography developers'
    __email__ = 'cryptography-dev@python.org'
    __license__ = 'BSD or Apache License, Version 2.0'
    __summary__ = 'cryptography is a package which provides cryptographic ...
    __title__ = 'cryptography'
    __uri__ = 'https://github.com/pyca/cryptography'

VERSION
    2.8

AUTHOR
    The cryptography developers

FILE
    /usr/lib/python3/dist-packages/cryptography/__init__.py

[mozoko]

thanks.