node tests: Use mock_template in compose.
node tests: Use mock_template in compose.

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