Moved MD-SAL openflow utility classes from net-virt-providers to its own Utility library that can be embedded into various applications.

Change-Id: I87ff6ae4e61e1859bf0a32d76efc98fb483899cf
Signed-off-by: Madhu Venugopal <mavenugo@gmail.com>
Merge "Moved MD-SAL openflow utility classes from net-virt-providers to its own Utility library that can be embedded into various applications."