Refactor dumpstate service entries into objects

Introduce the concept that a dumpstate host service is a full-fleged object
instead of a command-line. This is a no-op CL, but it is a first obvious
step towards refactoring the host service logic into a more configurable
and testable model

Bug: 169089135
Test: generate bugreport, all server data is sent over from host
Change-Id: I68159eda00686e527c802d29aa357c31ecbdd142