added enable_client field in the resource user of Rest API
Merge branch 'master' into 4890_avtivate_cti_client
changed the User-CTI profile association to a CTI configuration for a user; added the 'enabled' parameter to this CTI configuration
corrected error message in user CTI config edition
Merge remote-tracking branch 'origin/4890_avtivate_cti_client'

* origin/4890_avtivate_cti_client:
  corrected error message in user CTI config edition
  changed the User-CTI profile association to a CTI configuration for a user; added the 'enabled' parameter to this CTI configuration
  added enable_client field in the resource user of Rest API