packaging: setup: config remote engine host access

Ask user whether to use ssh as root to access remote engine host,
or provide instructions to do actions there.

Allow signing a certificate by remote engine ca either way.

Change-Id: I67d709ba2b0138b8d372deb0b6de5e7a9836f417
Related-To: https://bugzilla.redhat.com/1118328
Signed-off-by: Yedidyah Bar David <didi@redhat.com>