Fixed wrong behavior when updating tenant or user with LDAP backends

User or tenent update request returns old value of field 'enabled'
when we use LDAP backends and flag tenant_enabled_emulation is True.

Closes-Bug: #1318927
Change-Id: I4b0c76a181e14a11df0cd14141abfdf78d4cedee
Merge "Fixed wrong behavior when updating tenant or user with LDAP backends"