Remove llvm-apps scripts

Remove llvm-apps scripts

These utilities were already largely broken and are now also obsolete.
In addition, they have too many issues (for example, dependencies on
Linux specifics) to keep around.  The few usable features left in the
clientctl script are not LLVM specific and, if anything, should be
recreated somewhere else.

Change-Id: Id5645cf21837bcee069f560ae72570fb38f75adc