naming: Remove unused ServesLeaf from Endpoint structure.

I suspect other "leaf" related concepts (such as v23/options.IsLeaf,
naming.IsLeaf etc.) can also be removed since I could not find active
code that acts upon it. But I will look into that later.

MultiPart: 1/2
Change-Id: I60694abae0b76914d2a3709947a0bb964f2c258f
2 files changed