test-install: Add support for focal.
test-install: Add support for focal.

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