Add screen_stop()

Change-Id: Iac84231cfda960c4197de5b6e8ba6eb19225169a
freshen the LDAP support

* Build the base DN from a given domain name
* Remove all hard-coded names to allow configuration of base DN
* Fix manager DN (cn=Manager,dc=...)
* Add ldap init_ldap()
* Add support for clean.sh

Change-Id: Ieb69be9740653645b8e000574ad3fe59a0f97540
Eradicate last of underscores in options

Change-Id: Ic0f93d41b6edfdc5deb82ae820e2c0c5a8bce24e
Merge branch 'ldap-ad' into dt-test
Merge branch 'screen-stop' into dt-test