Description of problem:
If a user signs in and goes to $server/zanata/profile/create, they can create a whole new user. This shouldn't generally be allowed.

Version-Release number of selected component (if applicable):
3.5

How reproducible:
Easy always

Steps to Reproduce:
1. Sign in
2. Go to 
3. $server/zanata/profile/create
4. Enter valid data for the fields, press Save

Actual results:
Assuming the username/email is unique, it will send a validation email and create a new user.

Expected results:
If the user is already validated, they should not be able to go to this page - it should redirect to their dashboard

Additional info:
If FAS is used for login, the user is presented with:
Error Validation failed for classes [org.zanata.model.security.HOpenIdCredentials] during persist time for groups [javax.validation.groups.Default, ] List of constraint violations:[ ConstraintViolationImpl{interpolatedMessage='{validator.unique}', propertyPath=, rootBeanClass=class org.zanata.model.security.HOpenIdCredentials, messageTemplate='{validator.unique}'} ]