Fix nsenter commands on centos

The follow-context switch is not valid on early releases of systemd. This
change removes the optional switch so that nsenter can work on all of
our platforms.

Change-Id: I13d05ba8bcfe785257a9cf98dbdb6024ec937816
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

connection/ssh.py

@@ -124,8 +124,7 @@ class Connection(SSH.Connection):
                         ' --net={path}/net'
                         ' --pid={path}/pid'
                         ' --uts={path}/uts'
-                        ' --ipc={path}/ipc'
-                        ' --follow-context').format(path=pid_path)
+                        ' --ipc={path}/ipc').format(path=pid_path)
             if _pad:
                 cmd = '%s -- su - %s -c %s' % (
                     _pad,