puppet: Move app_frontend_once out of prod configuration.
puppet: Move app_frontend_once out of prod configuration.

That logic made it inconvenient to run multiple prod servers with the
same top-level puppet configuration.

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