Add a new build-tools source stub for the netscape.ldap.LDAPSocketFactory class
that is part of the Mozilla LDAP SDK for Java.  Also, use this source stub to
create the org.opends.server.protocols.internal.InternalMozillaLDAPSocketFactory
class which implements that interface and allows users to more easily use the
Mozilla LDAP SDK for Java to invoke internal operations in the server.

Note that the source stub is used only to allow our code to compile.  Anyone
that wants to use the Mozilla LDAP SDK for Java to perform internal operations
will need to supply the full library containing the LDAP SDK for Java.