Fixes: #1038 Handle schema changes

contrib/openldap/update-from-1.0.3/remove-trust.ldif

+dn: cn=trust,cn=schema,cn=config
+changetype: modify
+delete: olcAttributeTypes
+olcAttributeTypes: {0}( 5.3.6.1.1.1.1.0 NAME 'trustModel' DESC 'Access scheme' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )
+olcAttributeTypes: {1}( 5.3.6.1.1.1.1.1 NAME 'accessTo' DESC 'Access to which servers user is allowed' EQUALITY caseIgnoreIA5Match SUBSTR caseIgnoreIA5SubstringsMatch SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 )
+-
+delete: olcObjectClasses
+olcObjectClasses: {0}( 5.3.6.1.1.1.2.0 NAME 'trustAccount' DESC 'Sets trust accounts information' SUP top AUXILIARY MUST trustModel MAY accessTo )
+