autopkgtest failed: -xpickle is not a recognized argument of regrtest.py

This patch removes -xpickle value from option -u and provides the additional fixes:
- redirects stderr to /dev/null when stopping apport to not exit the test if apport is already stopped
- Run the the under debian/script.py to fix stdin indirection imposed by adt-run
- debian/scripts.py waits for the child process to exit and exit with its return code.

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same diff without '-x'
adt doesn't like output to stderr.

This bug was fixed in the package python3.3 - 3.3.1-1ubuntu3

---------------
python3.3 (3.3.1-1ubuntu3) raring; urgency=low

  * Fix sysconfig.get_makefile_name() for the multiarch location.
  * Set the platinclude dir back to the non-multiarch include path,
    where the multiarch pyconfig.h compatibility header is found.
  * Fix autopkg tests.
  * More autopkgtest fixes (Jean-Baptiste Lallement):
    - redirect stderr of command 'stop apport' to /dev/null. output to stderr
      is an error for adt.
    - script.py waits for child to exit and exit with child's return code.
    - xpickle is not a valid value for option -u of regrtest.py. Removed it
      LP: #1169150.
  * Issue #17754, setting LANG and LC_ALL for the compiler call in ctypes/util.
  * Issue #17761, platform._parse_release_file doesn't close the
    /etc/lsb-release file, and doesn't know about 'Ubuntu'.
 -- Matthias Klose <email address hidden> Tue, 16 Apr 2013 17:33:35 +0200