node tests: Use zrequire in server_events.js.
node tests: Use zrequire in server_events.js.

eeshangarg/zulip,hackerkid/zulip,jackrzhang/zulip,brainwane/zulip,andersk/zulip,shubhamdhama/zulip,jackrzhang/zulip,andersk/zulip,rht/zulip,rht/zulip,rishig/zulip,brainwane/zulip,punchagan/zulip,brainwane/zulip,rht/zulip,rishig/zulip,hackerkid/zulip,punchagan/zulip,timabbott/zulip,mahim97/zulip,andersk/zulip,kou/zulip,andersk/zulip,punchagan/zulip,rishig/zulip,synicalsyntax/zulip,brainwane/zulip,kou/zulip,rht/zulip,dhcrzf/zulip,timabbott/zulip,mahim97/zulip,dhcrzf/zulip,zulip/zulip,brainwane/zulip,jackrzhang/zulip,punchagan/zulip,hackerkid/zulip,tommyip/zulip,rishig/zulip,showell/zulip,showell/zulip,tommyip/zulip,kou/zulip,tommyip/zulip,tommyip/zulip,jackrzhang/zulip,timabbott/zulip,brainwane/zulip,synicalsyntax/zulip,hackerkid/zulip,mahim97/zulip,shubhamdhama/zulip,rishig/zulip,kou/zulip,dhcrzf/zulip,rht/zulip,mahim97/zulip,zulip/zulip,zulip/zulip,timabbott/zulip,timabbott/zulip,eeshangarg/zulip,kou/zulip,andersk/zulip,synicalsyntax/zulip,brainwane/zulip,mahim97/zulip,dhcrzf/zulip,synicalsyntax/zulip,hackerkid/zulip,dhcrzf/zulip,jackrzhang/zulip,dhcrzf/zulip,punchagan/zulip,jackrzhang/zulip,eeshangarg/zulip,kou/zulip,showell/zulip,shubhamdhama/zulip,tommyip/zulip,hackerkid/zulip,eeshangarg/zulip,rishig/zulip,showell/zulip,tommyip/zulip,synicalsyntax/zulip,rht/zulip,mahim97/zulip,rishig/zulip,zulip/zulip,timabbott/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,tommyip/zulip,zulip/zulip,shubhamdhama/zulip,timabbott/zulip,synicalsyntax/zulip,jackrzhang/zulip,eeshangarg/zulip,showell/zulip,shubhamdhama/zulip,synicalsyntax/zulip,eeshangarg/zulip,showell/zulip,punchagan/zulip,shubhamdhama/zulip,shubhamdhama/zulip,dhcrzf/zulip,rht/zulip,showell/zulip,punchagan/zulip,andersk/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip