Add verbose option to supress error message

When no .netrc file is found, ade resorts to priting an error message.
This can be annoying when users want to use a remote server that doesn't
need auth.

This change demotes the error message to be displayed only in
verbose mode

Closes: https://phabricator.apertis.org/T6301



Signed-off-by: Ritesh Raj Sarraf <ritesh.sarraf@collabora.com>