Conditional enable the ldap configuration

If any of the existing ldap config(openldap/AD) is
already enabled,The other ldap configuration can't be
enabled.

TestedBy: Unit-Tested

          Tested the above behaviour.It throws the
          error back if try to enable the configuration
          when there is already active configuration.

          If there is no active configuration then it
          allows to enable the configuration.

Signed-off-by: Ratan Gupta <ratagupt@linux.vnet.ibm.com>
Change-Id: I5b6008036152cd36e5422bb372a05c8a3ec3d24b
5 files changed