ltp: remove useless script STPfailure_report.pl

ltp: remove useless script STPfailure_report.pl

* Remove useless script STPfailure_report.pl to
  avoid confusing about this script fails to run
  as it lacks dependency on some perl module such
  as LWP::Simple

  - The script STPfailure_report.pl previously is
    added as a tool to analyze failures from LTP
    runs on the OSDL's Scaleable Test Platform (STP) as below:

    commit f0573facbbbf14798cc5b7d4653a5e46b4b95fa5
    Author: robbiew <robbiew>
    Date: Wed Apr 28 19:21:39 2004 +0000

    Added tool for analyzing failures from LTP runs on
    the OSDL's Scaleable Test Platform (STP)

  - And the script STPfailure_report.pl mainly accesses
    http://khack.osdl.org to retrieve ltp test results
    run on OSDL's Scaleable Test Platform (STP) and prints
    the reports, and now the website http://khack.osdl.org
    not accessible, so the script is useless and drop it
    and not ship it on target system

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>