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.

(cherry picked from commit 4194f3c2e51f2c0985d1b8387acd8d8dd56a8163)
Signed-off-by: Brent Salisbury <brent.salisbury@gmail.com>
Signed-off-by: Michal Rehak <mirehak@cisco.com>
Change-Id: I58ffb762f3ffb87d1721f37ddaef7078341fa308