PDFBOX-2456: add the check of permissions for three files created by Maruan Sahyoun with Adobe Reader; expand existing tests for seq and nonseq parser and open with owner and user password

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1639904 13f79535-47bb-0310-9956-ffa450edef68