Remove an obsolete lctl command ("lov_getconfig"), as well as the ioctl that it was calling. It was only recently used by sanity test_44a, which can instead use "lfs getstripe -d $DIR" now that LU-11656 is landed.

The lctl command list should also be reordered so that the "testing (DANGEROUS)" commands are listed at the end, and LFSCK and llog commands are before that, to avoid confusion.

There are also a number of very ancient jt_ptl_ and jt_obd_ function definitions and ancient ioctl numbers defined that are no longer used and can be removed.