* Added support to configure trace type as a

* Added support to configure trace type as a
  configuration parameter.  This can be any combination
  of nodeid, interface indices, timestamp and appdata.
  This configuration is passed through packet header by
  encap node to all other nodes. Rewrite buffer is resized
  accordingly. Trace function modified accordingly.
* Added CLI 'show ioam summary' command to display various
  configuration.
* Added CLI 'clear ioam rewrite'

Change-Id: Ide4c85f8b22561303df48519c5ea59668a300188
Signed-off-by: rangan <[email protected]>