add qpid-python to neutron's requirements.txt

[Richard Su]

If one tries using qpid instead of rabbitmq with heat, when neutron-server starts up it will complain that the qpid.messaging library is missing. To fix this, qpid-python should be included in requirements.txt.

2013-09-13 23:29:56.576 8875 TRACE neutron.common.config File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_qpid.py", line 753, in create_connection
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config rpc_amqp.get_connection_pool(conf, Connection))
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/openstack/common/rpc/amqp.py", line 522, in create_connection
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config return ConnectionContext(conf, connection_pool, pooled=not new)
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/openstack/common/rpc/amqp.py", line 126, in __init__
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config server_params=server_params)
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config File "/opt/stack/venvs/neutron/local/lib/python2.7/site-packages/neutron/openstack/common/rpc/impl_qpid.py", line 432, in __init__
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config raise ImportError("Failed to import qpid.messaging")
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config ImportError: Failed to import qpid.messaging
2013-09-13 23:29:56.576 8875 TRACE neutron.common.config

[Mark McClain (markmcclain)]

qpid is an optional dependency of Neutron (and really OpenStack in general). If you want to enable it, these instructions must be followed: https://wiki.openstack.org/wiki/QpidSupport.

[Robert Collins (lifeless)]

Could you please reconsider this? oslo messaging has support for qpid - it isn't a third-party patch that folk are doing out of tree, so making the library needed to access it be treated as a third party patch is very hard to understand.