Ticket #3167: copyright issues.

lib/strutil/xstrtol.c: restore copyright line.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Fix name of FSF in all *.c files.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
tests/lib/vfs: update copyright notice.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
Merge branch '3167_copyright'

* 3167_copyright:
  tests/lib/vfs: update copyright notice.
  Fix name of FSF in all *.c files.
  Ticket #3167: copyright issues.