Replace backported one with just the code used

Sorry bjoern, ripped out what you'd added and just used the code because
the doctest was failing for some unknown reason and we didn't ever need
to reuse the function, so ... easier this way

lib/galaxy/web/base/interactive_environments.py

@@ -5,7 +5,6 @@
 import stat
 import random
 import tempfile
-import subprocess
 from subprocess import Popen, PIPE
 
 from galaxy.util.bunch import Bunch
@@ -17,32 +16,6 @@
 log = logging.getLogger(__name__)
 
 
-# Python 2.6 does not support the check_output command.
-# As a workaround we use a backport from https://gist.github.com/edufelipe/1027906
-# until we do not support Python 2.6 anymore.
-
-if "check_output" not in dir( subprocess ):
-    def check_output(*popenargs, **kwargs):
-        r"""Run command with arguments and return its output as a byte string.
-        Backported from Python 2.7 as it's implemented as pure python on stdlib.
-        >>> check_output(['/usr/bin/python', '--version'])
-        Python 2.6.2
-        """
-        process = subprocess.Popen(stdout=subprocess.PIPE, *popenargs, **kwargs)
-        output, unused_err = process.communicate()
-        retcode = process.poll()
-        if retcode:
-            cmd = kwargs.get("args")
-            if cmd is None:
-                cmd = popenargs[0]
-            error = subprocess.CalledProcessError(retcode, cmd)
-            error.output = output
-            raise error
-        return output
-else:
-    from subprocess import check_output
-
-
 class InteractiveEnviornmentRequest(object):
 
     def __init__(self, trans, plugin):
@@ -287,8 +260,14 @@ def get_proxied_ports(self, container_id):
             container_id,
             command
         ))
-        output = check_output(command, shell=True)
-        inspect_data = json.loads(output)
+
+        p = Popen(command, stdout=PIPE, stderr=PIPE, close_fds=True, shell=True)
+        stdout, stderr = p.communicate()
+        if p.returncode != 0 or len(stderr):
+            log.error( "%s\n%s" % (stdout, stderr) )
+            return None
+
+        inspect_data = json.loads(stdout)
         # [{
         #     "NetworkSettings" : {
         #         "Ports" : {