Verify SSL public key on upload.
Verify SSL public key on upload.

Using openssl, verify that the uploaded key is an SSL public key. If
it is not, alert the user and display the form again.

tcmitchell/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,tcmitchell/geni-portal,charliemeyer/geni-portal,charliemeyer/geni-portal