Update of customer language setting fails when user is from an active directory

As result of scala to java conversion https://jdog.jira-dev.com/browse/FREE-575
updating of profile started unconditionally call crowdService.updateUser in CustomerProfileService#updateUserBasicInfo which fails if underline AD is read-only

Should call it only if display name or email address is requested to change

Steps to Reproduce.

1. Connect JIRA to an Active Directory that is read-only
2. Fetch your Service Desk customers from this active directory.
3. Go to customer portal and attempt to change the customer's profile language to a different one.

Expected

JIRA would change the language and store the information in the database.

Actual

JIRA would attempt to update the active directory and throw an error that it cannot update the directory because of directory settings.

Notes

• Replicable using ApacheDirectory Studio with Read Only with Local Groups
• Error in the logs will be:

  2017-02-08 18:55:03,733 http-nio-8730-exec-25 ERROR apache4 1135x245x1 1jeqvkj 10.60.6.142 /rest/servicedesk/1/customer/user [c.a.p.r.c.error.jersey.ThrowableExceptionMapper] Uncaught exception thrown by REST service: com.atlassian.crowd.exception.OperationNotPermittedException: com.atlassian.crowd.exception.ApplicationPermissionException: Cannot update user 'apache4' because directory 'Atlassian Test' does not allow updates.
  java.lang.RuntimeException: com.atlassian.crowd.exception.OperationNotPermittedException: com.atlassian.crowd.exception.ApplicationPermissionException: Cannot update user 'apache4' because directory 'Atlassian Test' does not allow updates.
  	at com.atlassian.servicedesk.internal.feature.customer.user.CustomerProfileService.updateUserWithValidatedRequest(CustomerProfileService.java:110)
  	at com.atlassian.servicedesk.internal.feature.customer.user.CustomerProfileService.lambda$updateProfile$0(CustomerProfileService.java:96)
  ...
   

• It affects avatar as well.

Workaround

Use Read/Write LDAP Permission

Not possible with a federated active directory configuration.