ui: display all wizard step 1 errors

Change-Id: Id5ee9bb1222cb306b8eb5459406b662c46dfa879
Reviewed-on: http://review.couchbase.org/42866
Reviewed-by: Artem Stemkovski <artem@couchbase.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>