Make the file larger and read 64k from it instead of 16k so that it pulls in a full page from the middle of the file. Merge of master-melb:xfs-cmds:30703a by kenmcd. Use a large file and 64k I/O size so the test works on 64k page size machines.
Merge of master-melb:xfs-cmds:27661a by kenmcd. Added QA test for xfs_io mread command