configure-rabbitmq: Add support for RABBITMQ_NODE flag.
configure-rabbitmq: Add support for RABBITMQ_NODE flag.

This can potentially be used by things like a Docker configuration
that runs RabbitMQ on another server.

rht/zulip,jphilipsen05/zulip,hackerkid/zulip,jackrzhang/zulip,synicalsyntax/zulip,tommyip/zulip,vabs22/zulip,hackerkid/zulip,Galexrt/zulip,rishig/zulip,hackerkid/zulip,showell/zulip,verma-varsha/zulip,jrowan/zulip,kou/zulip,amanharitsh123/zulip,eeshangarg/zulip,tommyip/zulip,brainwane/zulip,jackrzhang/zulip,jphilipsen05/zulip,jackrzhang/zulip,jackrzhang/zulip,rishig/zulip,vaidap/zulip,jphilipsen05/zulip,showell/zulip,zulip/zulip,brainwane/zulip,shubhamdhama/zulip,jphilipsen05/zulip,dhcrzf/zulip,brockwhittaker/zulip,mahim97/zulip,vaidap/zulip,eeshangarg/zulip,ryanbackman/zulip,rht/zulip,tommyip/zulip,shubhamdhama/zulip,jphilipsen05/zulip,christi3k/zulip,rishig/zulip,vabs22/zulip,christi3k/zulip,hackerkid/zulip,Galexrt/zulip,zulip/zulip,brockwhittaker/zulip,rht/zulip,rht/zulip,dhcrzf/zulip,vabs22/zulip,shubhamdhama/zulip,ryanbackman/zulip,brockwhittaker/zulip,jrowan/zulip,ryanbackman/zulip,dhcrzf/zulip,mahim97/zulip,christi3k/zulip,showell/zulip,andersk/zulip,brainwane/zulip,mahim97/zulip,jrowan/zulip,punchagan/zulip,timabbott/zulip,dhcrzf/zulip,kou/zulip,eeshangarg/zulip,Galexrt/zulip,jackrzhang/zulip,brainwane/zulip,tommyip/zulip,brockwhittaker/zulip,verma-varsha/zulip,andersk/zulip,synicalsyntax/zulip,j831/zulip,verma-varsha/zulip,rishig/zulip,shubhamdhama/zulip,kou/zulip,andersk/zulip,hackerkid/zulip,amanharitsh123/zulip,eeshangarg/zulip,jrowan/zulip,Galexrt/zulip,christi3k/zulip,punchagan/zulip,mahim97/zulip,kou/zulip,zulip/zulip,kou/zulip,j831/zulip,tommyip/zulip,christi3k/zulip,mahim97/zulip,amanharitsh123/zulip,kou/zulip,showell/zulip,vabs22/zulip,amanharitsh123/zulip,brainwane/zulip,punchagan/zulip,synicalsyntax/zulip,jrowan/zulip,synicalsyntax/zulip,jrowan/zulip,timabbott/zulip,timabbott/zulip,brainwane/zulip,j831/zulip,timabbott/zulip,dhcrzf/zulip,hackerkid/zulip,synicalsyntax/zulip,zulip/zulip,Galexrt/zulip,punchagan/zulip,verma-varsha/zulip,ryanbackman/zulip,showell/zulip,zulip/zulip,shubhamdhama/zulip,vabs22/zulip,rishig/zulip,zulip/zulip,showell/zulip,ryanbackman/zulip,punchagan/zulip,synicalsyntax/zulip,dhcrzf/zulip,hackerkid/zulip,punchagan/zulip,ryanbackman/zulip,Galexrt/zulip,rht/zulip,vaidap/zulip,brockwhittaker/zulip,rht/zulip,j831/zulip,tommyip/zulip,verma-varsha/zulip,vaidap/zulip,andersk/zulip,j831/zulip,jackrzhang/zulip,amanharitsh123/zulip,vaidap/zulip,synicalsyntax/zulip,timabbott/zulip,kou/zulip,verma-varsha/zulip,rishig/zulip,j831/zulip,eeshangarg/zulip,dhcrzf/zulip,brainwane/zulip,andersk/zulip,shubhamdhama/zulip,jphilipsen05/zulip,eeshangarg/zulip,timabbott/zulip,christi3k/zulip,brockwhittaker/zulip,tommyip/zulip,showell/zulip,amanharitsh123/zulip,zulip/zulip,rishig/zulip,shubhamdhama/zulip,rht/zulip,timabbott/zulip,vabs22/zulip,eeshangarg/zulip,andersk/zulip,mahim97/zulip,vaidap/zulip,andersk/zulip,Galexrt/zulip,jackrzhang/zulip,punchagan/zulip