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
Updates .gitignore

Closes-Bug: #1255854

Change-Id: I22b6fa351dd5b654783f432c01785c706eff8397
Use fixed network for ssh when n-net is enabled

Server rebuild test has stability issues with n-net + floating ip.

Change-Id: I8a921fddbca49c8499938a25f9722ea40cee76cc
Merge "Updates .gitignore"
Merge "Use fixed network for ssh when n-net is enabled"
Merge "freshen the LDAP support"