dep8 test: redirect stderr to stdout and exit with appropriate code

[Jean-Baptiste Lallement]

autopkgtest of tabix currently fails with:
adt-run: trace: & dsc0t-with-example-data: - - - - - - - - - - results - - - - - - - - - -
dsc0t-with-example-data FAIL status: 0, stderr: [tabix] The file type not recognise...
adt-run: trace: & dsc0t-with-example-data: - - - - - - - - - - stderr - - - - - - - - - -
[tabix] The file type not recognised and -p not given, using the preset [gff].
adt-run: trace: & dsc0t-with-example-data: ----------------------------------------]

https://jenkins.qa.ubuntu.com/view/Quantal/view/AutoPkg%20Test/job/quantal-adt-tabix/3/ARCH=amd64,label=albali/artifact/results/log/*view*/

This is because the warning is written to stderr while per specification of DEP8 it should be written to stdout.

Excerpt from http://anonscm.debian.org/gitweb/?p=autopkgtest/autopkgtest.git;a=blob_plain;f=doc/README.package-tests;hb=HEAD:
"""
Each test program should, on success, exit with status 0 and print nothing to stderr; if a test exits nonzero, or prints to stderr, it is considered to have failed.
"""

The dep8 test should be updated either to use the option -p of tabix to fix the message or redirect stderr to stdout and exit with an appropriate exit code.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: tabix (not installed)
ProcVersionSignature: Ubuntu 3.5.0-3.3-generic 3.5.0-rc5
Uname: Linux 3.5.0-3-generic x86_64
ApportVersion: 2.2.5-0ubuntu2
Architecture: amd64
Date: Fri Jul 6 00:06:59 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64+mac (20120328)
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: tabix
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

This bug was fixed in the package tabix - 0.2.6-1git1

---------------
tabix (0.2.6-1git1) raring; urgency=low

  Upload current Debian packaging git to fix autopkgtest error.

  [ Charles Plessy ]
  b8d4e98 Indicate format to avoid stderr comment that makes autopkgtest fail.
          Closes: #680473, LP: #1021500
 -- Martin Pitt <email address hidden> Wed, 21 Nov 2012 07:55:30 +0100