Raise error on wizard when the user enter unsupported characters  for the CA
removed unused paramter in method isCreated
EBox::CA::checkCertificateFieldsCharacters is now a public method
Merge branch 'jag/openchange-wizard-bad-char' of github.com:Zentyal/zentyal into openchange-wizard-bad-char
Merge pull request #1634 from Zentyal/jag/openchange-wizard-bad-char

 	Raise error on wizard when the user enter unsupported characters for CA fields