Shouldn't log the relation data

[Andreas Hasenack]

2013-11-07 16:39:39 DEBUG worker.uniter.jujuc server.go:109 hook context id "apache2/0:reverseproxy-relation-changed:3728737111424666614"; dir "/var/lib/juju/agents/unit-apache2-0/charm"
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK Traceback (most recent call last):
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-apache2-0/charm/hooks/reverseproxy-relation-changed", line 591, in <module>
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK main(hook_name)
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-apache2-0/charm/hooks/reverseproxy-relation-changed", line 560, in main
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK config_changed()
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-apache2-0/charm/hooks/reverseproxy-relation-changed", line 398, in config_changed
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK log("Writing file: %s with data: %s" % (vhost_file, template_data))
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/var/lib/juju/agents/unit-apache2-0/charm/hooks/charmhelpers/core/hookenv.py", line 65, in log
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK subprocess.call(command)
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/usr/lib/python2.7/subprocess.py", line 493, in call
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK return Popen(*popenargs, **kwargs).wait()
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK errread, errwrite)
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK raise child_exception
2013-11-07 16:39:39 INFO juju.worker.uniter context.go:255 HOOK OSError: [Errno 7] Argument list too long
2013-11-07 16:39:39 ERROR juju.worker.uniter uniter.go:350 hook failed: exit status 1

line 398 is:
            log("Writing file: %s with data: %s" % (vhost_file, template_data))