Added fshtestadm
Squashed commit of the following:

commit 13d780f3cc4275cfd808951542b694dcc7d3343d
Author: Damian Bogel <damian.bogel@gmail.com>
Date:   Tue Sep 3 17:19:09 2013 +0200

    Fixed fsd_detach.
    Deleted fsd_callback_free (it's unnecessary, becuase when vfs_t is
    being destroyed, hook remove callbacks are being fired).
fsht_detach fixed
pbchk fixes in fsd.c and fshtestadm.c
Added enabled/disabled flag to fsht.
Updated fshtestadm accordingly.
Squashed commit of the following:

commit 324fab3601451d44bb08669b20fe0da7c71ca104
Author: Damian Bogel <damian.bogel@gmail.com>
Date:   Wed Sep 4 11:40:14 2013 +0200

    Fixed unprotected fsd_enabled in fsd_ioctl() issue.

commit f7762820494aa2892bc583d2aaf0740d8ac14b59
Author: Damian Bogel <damian.bogel@gmail.com>
Date:   Tue Sep 3 17:19:09 2013 +0200

    Fixed fsd_detach.
    Deleted fsd_callback_free (it's unnecessary, becuase when vfs_t is
    being destroyed, hook remove callbacks are being fired).
fshtest suite