Rather than removing all port mappings, we simply remap port 80 mappings to 443. The previous behavior would remove custom port mappings for all applications and reset them on any certificate change, preventing automation from plugins such as letsencrypt. While this behavior doesn't matter for buildpack deploys - which only expose a single port on container port 5000 - Dockerfile deploys would frequently be affected by such a change, requiring a remapping of all custom ports.
This commit also standardizes on the method used to source the proxy functions
Fixesdokku/dokku-letsencrypt#67
Change the certs:add command to use a file import without trying to
detect a piped-in tarball if server.crt and server.key files were passed
in as arguments and those files exist.
Fixes hangs on certificate imports by filename when the check for a
STDIN pipe fails e.g. when running dokku remotely using a SSH command.
