tools/misc: Delete more obsolete utilities

tools/misc: Delete more obsolete utilities

* nsplitd has been orphaned from the build since its introduction in c/s
  dc44ed4764 (in 2004), and never been developed since.  While it does appear
  to compile, it is full of pointer width mismatch, pointer sign mismatch, and
  uninitialised variable warnings, which makes it unlikely to function
  correctly when compiled for a 64bit environment.

* xen-python-path was declared obsolete in c/s 11e1149fe (in 2009) and can't
  actually be used correctly by out-of-tree components.  5 years is long enough
  for out-of-tree callers to catch up.

There are no subdirectories any more, so drop the notion from the Makefile.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
CC: Ian Campbell <Ian.Campbell@citrix.com>
CC: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Wei Liu <wei.liu2@citrix.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>