selftests: net: add tc flower cfm test

New cfm flower test case is added to the net forwarding selfttests.

Example output:

# ./tc_flower_cfm.sh p1 p2
TEST: CFM opcode match test

selftests: net: add tc flower cfm test

New cfm flower test case is added to the net forwarding selfttests.

Example output:

# ./tc_flower_cfm.sh p1 p2
TEST: CFM opcode match test [ OK ]
TEST: CFM level match test [ OK ]
TEST: CFM opcode and level match test [ OK ]

Signed-off-by: Zahari Doychev <zdoychev@maxlinear.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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