Bug 1071: Invalid value used for frame priority code point in OFCommandProvider

-Adjusted to a magic number in bounds for PCP (0-7) to enable the test to stop failing for the function f80 in OpenFlowPluginTestCommandProvider.

Change-Id: Ib146f228e174b6785dfe9fecf93fa7cabba79f4f
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>