BUG-1134: Added TCP flag conversions between md-sal and openflowjava

-Conversions from high level model (model-flow-base)
to low level models (ofjava).

-Test included in OpenflowpluginTestCommandProvider
as function addMDFlow f83() for testing.

-Test results here:
https://gist.github.com/04f96a080eb7ee32413b

---- Extensions info (see BUG-1133) ----
Support for extensions in OFPlugin is not going to be implemented
this way (for POC it is temporarily ok). Vendor specific messages
should be modeled in vendor bundle (augmenting MD-SAL or OFJAVA-API
models). Current strategy is based on trasnparent forwarding of
vendor messages through OFPlugin.
More info will be shortly at
https://wiki.opendaylight.org/view/OpenDaylight_OpenFlow_Plugin:Backlog:Extensibility

Change-Id: Ifaa835a43ec8e0b2fb23e84abf121aefdbcde339
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>
Signed-off-by: Michal Rehak <mirehak@cisco.com>