Add LDAP reply cleanup function in backend
A new function 'CleanupReply' has been added to the LDAPBridge. This function is responsible for cleaning up the reply channel associated with a given request ID. It has been set in lua global functions using the constant 'LuaFnCleanupLDAPReply' if LDAP backend is available.
Signed-off-by: Christian Roessner c@roessner.co