rabbitmq-upgrade: add page

pages/common/rabbitmq-upgrade.md

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+# rabbitmq-upgrade
+
+> Manage the upgrade of a RabbitMQ node.
+> More information: <https://www.rabbitmq.com/docs/man/rabbitmq-upgrade.8.html>.
+
+- Wait for all quorum queues to have an above minimum online quorum:
+
+`rabbitmq-upgrade await_online_quorum_plus_one`
+
+- Put the node in maintenance mode:
+
+`rabbitmq-upgrade drain`
+
+- Put the node out of maintenance and into regular operating mode:
+
+`rabbitmq-upgrade revive`
+
+- Run post-upgrade tasks:
+
+`rabbitmq-upgrade post_upgrade`
+
+- Display help:
+
+`rabbitmq-upgrade help`