Make this function only _print_ the info we have, and not read the username
from the credential-store.
This patch adds a Username field to the (local) `info` type, and sets it
when needed, so that prettyPrintServerInfo only has to format and print
the information, instead of calling out to the credential-store.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>