QPID-5309: don't set executable flag on page file

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1540039 13f79535-47bb-0310-9956-ffa450edef68
QPID-5300: correct error condition for certain unauthorized access errors

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1540040 13f79535-47bb-0310-9956-ffa450edef68
QPID-5299: check access permissions before resolving node

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1540041 13f79535-47bb-0310-9956-ffa450edef68