title: Impdp with remap failing on POST_TABLE_ACTION still using old schema
body: <p>I'm trying to import an oracle dump while remapping schema and tablespace:</p>
  
  <pre><code>impdp usr/pass \
      EXCLUDE=table_statistics \
      DIRECTORY=EXPDP \
      REMAP_SCHEMA=ORG_USR:NEW_USR \
      REMAP_TABLESPACE=ORG_TS:NEW_TS \
      DUMPFILE=FILE.dmp \
      PARALLEL=2 \
      LOGFILE=FILE.imp.log
  </code></pre>
  
  <p>The job imports all tables and then starts processing object types:</p>
  
  <pre><code>Import: Release 12.1.0.2.0 - Production on Thu Aug 17 11:13:06 2017
  
  [ ... the import remaps correct ]
  
  Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
  . . imported "NEW_USR"."SOMETABLE"              112.4 MB 1402414 rows
  . . imported "NEW_USR"."SOMEOTHERTABLE"                 235.9 MB  955249 rows
  . . imported "NEW_USR"."SOMETABLE3"                 86.91 MB  440513 rows
  
  [... everything works until ...]
  
  Processing object type SCHEMA_EXPORT/TABLE/TRIGGER
  Processing object type SCHEMA_EXPORT/STATISTICS/MARKER
  Processing object type SCHEMA_EXPORT/TABLE/POST_TABLE_ACTION
  ORA-39083: Object type POST_TABLE_ACTION failed to create with error:
  ORA-01435: user does not exist
  Failing sql is:
  BEGIN
   SYS.DBMS_SNAPSHOT_UTL.SYNC_UP_LOG('ORG_USR','TABLEA');
   END;
  ORA-39083: Object type POST_TABLE_ACTION failed to create with error:
  ORA-01435: user does not exist
  Failing sql is:
  BEGIN
   SYS.DBMS_SNAPSHOT_UTL.SYNC_UP_LOG('ORG_USR','TABLEB');
   END;
  ORA-39083: Object type POST_TABLE_ACTION failed to create with error:
  ORA-01435: user does not exist
  Failing sql is:
  BEGIN
   SYS.DBMS_SNAPSHOT_UTL.SYNC_UP_LOG('ORG_USR','TABLEC');
   END;
  Processing object type SCHEMA_EXPORT/MATERIALIZED_VIEW
  Processing object type SCHEMA_EXPORT/TABLE/MATERIALIZED_VIEW_LOG
  Job "SYSTEM"."SYS_IMPORT_FULL_01" completed with 3 error(s) at Thu Aug 17 11:19:02 2017 elapsed 0 00:05:56
  </code></pre>
  
  <p>I did specify <code>REMAP_SCHEMA</code> and <code>REMAP_TABLESPACE</code>, and the import runs <em>mostly</em> correct.</p>
  
  <p>BUT at the end part trying <code>Processing object type SCHEMA_EXPORT/TABLE/POST_TABLE_ACTION</code> it somehow fails using the OLD User.</p>
  
  <p>Can someone tell me what ist going wrong and how to fix it?</p>