Optimize user-add by caching ldap2.has_upg()
The method has_upg returns if user private groups are enabled or
disabled. has_upg() is called three times by user-add. The setting is
now cached on the request local variable context to speed up batch
processing of user imports.
context is cleared after every request.
Related: https://pagure.io/freeipa/issue/8134
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>