node fixtures: Clean up user_group data.
node fixtures: Clean up user_group data.

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