Move hypervisor ethernet to separate methods

Similar to the code we've been building elsewhere, move ethernet Hypervisor
to separate methods, and avoid lambdas.

Tested: Code compiles. Tested as part of top patch.

Change-Id: I3f49b3824c212a9b1e8129b99265ed7a470b3e18
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>