tc-testing: updated pedit test cases

Added TDC test cases for Ethernet LAYERED_OP operations:
- set single source Ethernet MAC
- set single destination Ethernet MAC
- set single invalid destination Ethernet MAC
- set Ethernet type
- invert source/destination/type fields
- add operation on Ethernet type field

Signed-off-by: Roman Mashak <mrv@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>