Add CPU steal, CPU Guest and CPU Guest Nice to host CPU counter block

git-svn-id: svn://svn.code.sf.net/p/host-sflow/code@492 c0bd136a-9412-4574-afac-2923e5188ea6
avoid compiler warning

git-svn-id: svn://svn.code.sf.net/p/host-sflow/code@493 c0bd136a-9412-4574-afac-2923e5188ea6
Docker counters appear under different path on Ubuntu / Debian

git-svn-id: svn://svn.code.sf.net/p/host-sflow/code@494 c0bd136a-9412-4574-afac-2923e5188ea6