testscripts: Remove exportfs.sh

Script is outdated (uses directly rsh, reiserfs, jfs).

Testing to mount NFS with exportfs is done in NFS tests (in nfs_lib.sh)
and also partly in statx07, thus not needed to turn this script into LTP
test.

Signed-off-by: Petr Vorel <[email protected]>
Acked-by: Xiao Yang <[email protected]>

Author: pevik

doc/ltp-run-files.txt

@@ -69,7 +69,6 @@ other filesystem or disk type tests
  - autofs1.sh
  - autofs4.sh
  - diskio.sh
- - exportfs.sh
  - isofs.sh
  - sysfs.sh