Fix a few LDIF bugs

tests/data/lang-out.ldif

 dn: dc=example,dc=com
-objectClass: dcObject
+dc: example
 objectClass: organization
 objectClass: extensibleObject
-dc: example
 o: Example, Inc.
 o;lang-x;lang-xx;lang-y;lang-yy;lang-z;lang-zz: Example, Inc.
 name;lang-en-us: Billy Ray

tests/data/test-lang.ldif

 dn: dc=example,dc=com
-objectclass: dcobject
 dc: example
 objectClass: organization
 objectClass: extensibleObject

tests/data/test-ordered-cp.ldif

 #LEAD COMMENT
 dn: dc=example,dc=com
-objectclass: dcobject
 dc: example
 #EMBEDDED COMMENT
 objectclass: organization
 objectclass: domainRelatedObject
+objectclass: dcobject
 l: Anytown, Michigan
 st: Michigan
 o: Example, Inc.