Signed-off-by: Antonio Ojea <aojea@redhat.com>

Make the error handling consistent by:

* Using github.com/pkg/errors to wrap errors before returning.
* Having consistent format specifiers for logs.
* Using `fmt.Errorf()` for non-wrapping errors.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

Signed-off-by: baude <bbaude@redhat.com>