node tests: Default overlay functions to false.
node tests: Default overlay functions to false.

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