bay-create failure without "name"

[Shu Muto]

currently magnum allow to create without name.
but it's failed with below error.

TypeError: value argument must be a text type.
Traceback (most recent call last):

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 142, in _dispatch_and_reply
    executor_callback))

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 186, in _dispatch
    executor_callback)

  File "/usr/local/lib/python2.7/dist-packages/oslo_messaging/rpc/dispatcher.py", line 129, in _do_dispatch
    result = func(ctxt, **new_args)

  File "/opt/stack/magnum/magnum/conductor/handlers/bay_conductor.py", line 127, in bay_create
    cert_manager.generate_certificates_to_bay(bay)

  File "/opt/stack/magnum/magnum/conductor/handlers/common/cert_manager.py", line 84, in generate_certificates_to_bay
    ca_cert_ref, ca_cert, ca_password = _generate_ca_cert(issuer_name)

  File "/opt/stack/magnum/magnum/conductor/handlers/common/cert_manager.py", line 38, in _generate_ca_cert
    encryption_password=ca_password)

  File "/opt/stack/magnum/magnum/common/x509/operations.py", line 43, in generate_ca_certificate
    encryption_password=encryption_password

  File "/opt/stack/magnum/magnum/common/x509/operations.py", line 95, in _generate_self_signed_certificate
    encryption_password=encryption_password)

  File "/opt/stack/magnum/magnum/common/x509/operations.py", line 109, in _generate_certificate
    x509.NameAttribute(x509.OID_COMMON_NAME, subject_name),

  File "/usr/local/lib/python2.7/dist-packages/cryptography/x509/name.py", line 22, in __init__
    "value argument must be a text type."

TypeError: value argument must be a text type.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/235114

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/235114
Committed: https://git.openstack.org/cgit/openstack/magnum/commit/?id=8f41e712bace54cbc4d9b01b397124f757c6fbd0
Submitter: Jenkins
Branch: master

commit 8f41e712bace54cbc4d9b01b397124f757c6fbd0
Author: OTSUKA, Yuanying <email address hidden>
Date: Thu Oct 15 15:47:58 2015 +0900

    Fix bay-create failure without "name"

    Currently magnum allow to create bay without name. But it's failed
    because `cert_manager.generate_certificates_to_bay` requires bay
    "name".
    This fixes it to use bay "uuid" instead of bay "name".

    Change-Id: I5da8910fcf8b71f9521abb48e72dc178c3785104
    Closes-Bug: #1506314