queue: Switch tests to start_json_consumer interface.
queue: Switch tests to start_json_consumer interface.

hackerkid/zulip,andersk/zulip,hackerkid/zulip,andersk/zulip,rht/zulip,punchagan/zulip,kou/zulip,eeshangarg/zulip,zulip/zulip,kou/zulip,hackerkid/zulip,hackerkid/zulip,zulip/zulip,punchagan/zulip,rht/zulip,rht/zulip,hackerkid/zulip,rht/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,punchagan/zulip,kou/zulip,showell/zulip,showell/zulip,showell/zulip,kou/zulip,rht/zulip,showell/zulip,andersk/zulip,punchagan/zulip,zulip/zulip,eeshangarg/zulip,andersk/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,showell/zulip,kou/zulip,punchagan/zulip,andersk/zulip,andersk/zulip,punchagan/zulip,showell/zulip,rht/zulip,hackerkid/zulip,kou/zulip,kou/zulip,punchagan/zulip,zulip/zulip,zulip/zulip,eeshangarg/zulip,zulip/zulip,showell/zulip,eeshangarg/zulip,hackerkid/zulip