Define each server/port combination on its own line

When referencing
http://cbonte.github.io/haproxy-dconv/configuration-1.4.html#5 and
http://cbonte.github.io/haproxy-dconv/configuration-1.4.html#server it
does not appear that having multiple address/port combinations on one
line is officially supported, and indeed the "check" option only applies
to the first port, not later ones.

This commit breaks each server into its own line.
Merge pull request #93 from hunner/fix_backend_port

Define each server/port combination on its own line