partitioning tests (wip)
replaced arbitrary sleep with smarter file content test
Added system property option to container/admin

System properties may now be passed to the container/admin
processes. Previously all system properties from the test
JVM were being passed to the container which caused the
following when running from IDEA:

  Error occurred during initialization of VM
  java.lang.UnsatisfiedLinkError:
    java.lang.Class.getClassLoader0()Ljava//lang//ClassLoader;

Also fixed an issue where the admin server throws a
NoNodeException when attempting to return the list of
containers before either the admin or a container has
the chance to create the /xd/containers path.