python-ansible: add crypto module for stx 5.0

* crypto module is required for stx 5.0, or the ansible
  bootstrap failed with:

  ```
  fatal: [localhost]: FAILED! => {
      "reason": "no action detected in task. This often indicates a
      misspelled module name, or incorrect module path.\n\nThe error
      appears to be in
      '/usr/share/ansible/stx-ansible/playbooks/roles/common/create-etcd-certs/tasks/main.yml':
      line 12, column 3, but may\nbe elsewhere in the file depending
      on the exact syntax problem.\n\nThe offending line appears to
      be:\n\n\n- name: Generate private key for etcd server and
      client\n  ^ here\n"
  }
  ```

* add a patch for crypto module to allow the constraint value
  to be lower case to avoid the following issue:

  ```
  File
  "/tmp/ansible_openssl_csr_payload_OzIIJq/ansible_openssl_csr_payload.zip/ansible/module_utils/crypto.py",
  line 1821, in cryptography_get_basic_constraints
      raise OpenSSLObjectError('Unknown basic constraint value "{0}" for
      CA'.format(constraint[3:]))
  ```

Issue-ID: INF-215

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Change-Id: I856fc8f0ba9cdcb3137de2cffe3e5d9d13765f74