tests: fix race in dirrem01 and dirrem02

Previously the '--checkpoint-action=echo' was triggered after
'--checkpoint-action=sleep=1' - so the order of events *usually*
was (for --format='gnu'):

  ...
  1. checkpoint handler before write of 'dir/sub' member
  2. one-second delay
  3. stderr write: 'tar: Write checkpoint 3'
  4. write the member 'dir/sub' into the archive
  5. check that the member's ctime has not been changed
  6. genfile's detecting 'Write checkpoint', doing unlink
  ...

But sometimes, the genfile was fast enough to win the race and
unlinked the directory before the member was written into the
archive (IOW, the order was 1-2-3-6-4-5).  This led to the
occasional warning 'tar: dir/sub: file changed as we read it'.

Swap the order of 'sleep=1' and 'echo' actions so the genfile
utility has (hopefully) enough time to do the unlink before
writing the file into the archive (enforce 1-2-3-6-4-5 order).

* tests/dirrem01.at: Swap 'sleep=1' and 'echo' actions.
* tests/dirrem02.at: Likewise.

tests/dirrem01.at

@@ -47,14 +47,15 @@ gnu)   CPT=3;;
 esac
 
 genfile --run --checkpoint=$CPT --unlink dir/sub/file2 --unlink dir/sub -- \
-       tar --blocking-factor=1 --checkpoint=1 --checkpoint-action='sleep=1' \
-       --checkpoint-action='echo' -c -f archive.tar \
+       tar --blocking-factor=1 --checkpoint=1 --checkpoint-action='echo' \
+       --checkpoint-action='sleep=1' -c -f archive.tar \
        --listed-incremental db -v dir >/dev/null
 ],
 [1],
 [ignore],
 [tar: dir: Directory is new
 tar: dir/sub: Directory is new
+tar: dir/sub: file changed as we read it
 tar: dir/sub: File removed before we read it
 ],[],[],[gnu,posix])
 

tests/dirrem02.at

@@ -20,7 +20,7 @@
 
 # Description:
 #
-# When an explicitley named directory disappears during creation
+# When an explicitly named directory disappears during creation
 # of incremental dump, tar should still exit with TAREXIT_FAILURE (2).
 #
 # For further details see dirrem01.at
@@ -44,14 +44,15 @@ gnu)   CPT=3;;
 esac
 
 genfile --run --checkpoint=$CPT --unlink dir/sub/file2 --unlink dir/sub -- \
-       tar --blocking-factor=1 --checkpoint=1 --checkpoint-action='sleep=1' \
-       --checkpoint-action='echo' -c -f archive.tar \
+       tar --blocking-factor=1 --checkpoint=1 --checkpoint-action='echo' \
+       --checkpoint-action='sleep=1' -c -f archive.tar \
        --listed-incremental db -v dir dir/sub >/dev/null
 ],
 [2],
 [ignore],
 [tar: dir: Directory is new
 tar: dir/sub: Directory is new
+tar: dir/sub: file changed as we read it
 tar: dir/sub: Cannot open: No such file or directory
 tar: Exiting with failure status due to previous errors
 ],[],[],[gnu,posix])