setup-certbot: Treat potential existing certs with kid gloves.
setup-certbot: Treat potential existing certs with kid gloves.

This helps make this script suitable to run on existing installations,
by mitigating any worry about clobbering existing certs with links to
the new ones, in case the admin changes their mind or was using the
certs for something else too.

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