rabbitmq transient queue fixes

[thomaszwagerman]

See #194

Updates base.py to resolve INTERNAL_ERROR - Feature 'transient_nonexcl_queues' is deprecated error from RabbitMQ. See the rabbitmq 4.3.0 release notes.

Developed under time pressure for an external meeting, we may wish to review. Also see changes on ansible.

Instead of this we might want to pin rabbitmq to rabbitmq-server-4.2.5 in the polarroute/tasks/main.yml in ansible or (probably more maintainable) somehow through polarroute-server.

[github-actions]

Coverage Report

File	Stmts	Miss	Branch	BrPart	Cover	Missing
polarrouteserver
__init__.py	3	0	0	0	100%
_version.py	11	0	0	0	100%
celery.py	15	3	0	0	0	80%
polarrouteserver/route_api
__init__.py	4	0	0	0	100%
models.py	72	2	0	0	0	97%
responses.py	33	0	2	0	100%
serializers.py	120	5	36	4	4	94%
tasks.py	124	21	28	7	7	82%
utils.py	112	10	42	4	4	91%
views.py	276	17	52	4	4	94%
polarrouteserver/route_api/management
__init__.py	0	0	0	0	100%
polarrouteserver/route_api/management/commands
__init__.py	0	0	0	0	100%
ensure_adminuser.py	22	22	6	0	0	0%
insert_mesh.py	26	26	8	0	0	0%
polarrouteserver/utils
__init__.py	0	0	0	0	100%
loggers.py	10	10	0	0	0	0%
TOTAL	828	116	174	19	85%