Improve user message for confirmation
Improve user message for confirmation

When the user has successfully created their account request, tell
them an email has been sent and to follow the instructions in that
email.

GENI-NSF/geni-ar,charliemeyer/geni-ar,tcmitchell/geni-ar,tcmitchell/geni-ar,GENI-NSF/geni-ar,GENI-NSF/geni-ar,charliemeyer/geni-ar,GENI-NSF/geni-ar,tcmitchell/geni-ar,tcmitchell/geni-ar,charliemeyer/geni-ar,tcmitchell/geni-ar,charliemeyer/geni-ar,charliemeyer/geni-ar,GENI-NSF/geni-ar