Add support for raweth locator #131

Job	Run time
Check codebase format with clang-format	7s
Test multicast and unicast fragmentation	29s
Modular build on ubuntu-latest (1, 1, 1, 1)	40s
Build and test raweth transport on ubuntu-latest (1)	1m 24s
Modular build on ubuntu-latest (1, 1, 1, 0)	41s
Run unit tests on ubuntu-latest	36s
Build and test raweth transport on ubuntu-latest (0)	56s
Modular build on ubuntu-latest (1, 1, 0, 1)	1m 16s
Modular build on ubuntu-latest (1, 1, 0, 0)	32s
Modular build on ubuntu-latest (1, 0, 1, 1)	34s
Modular build on ubuntu-latest (1, 0, 1, 0)	34s
Modular build on ubuntu-latest (1, 0, 0, 1)	46s
Modular build on ubuntu-latest (1, 0, 0, 0)	47s
Modular build on ubuntu-latest (0, 1, 1, 1)	45s
Modular build on ubuntu-latest (0, 1, 1, 0)	42s
Modular build on ubuntu-latest (0, 1, 0, 1)	31s
Modular build on ubuntu-latest (0, 1, 0, 0)	22s
Modular build on ubuntu-latest (0, 0, 1, 1)	30s
Modular build on ubuntu-latest (0, 0, 1, 0)	37s
Modular build on ubuntu-latest (0, 0, 0, 1)	21s
Modular build on ubuntu-latest (0, 0, 0, 0)	21s
	13m 31s

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