[RabbitMQ] Error when an absolute queue name is used

[MartinDatadog]

When adding a queue in the rabbitmq.yaml with its absolute name i.e. vhost/queue_name, the datadog-agent runs into the following error:

Traceback (most recent call last):
File "/opt/datadog-agent/agent/checks/init.py", line 661, in run
self.check(copy.deepcopy(instance))
File "/opt/datadog-agent/agent/checks.d/rabbitmq.py", line 139, in check
QUEUE_TYPE], specified[QUEUE_TYPE], auth=auth)
File "/opt/datadog-agent/agent/checks.d/rabbitmq.py", line 214, in get_stats
explicit_filters.remove(name)
ValueError: list.remove(x): x not in list

Reported in ticket: https://datadog.zendesk.com/agent/tickets/29961

[yannmh]

Fixed with #1820. Thanks @MartinDatadog !