New protocol for property_service

New protocol assumes that there is no limit on name or value
and effectively removed limit on property name length.

It also send back a uint32_t with error code (or 0 on success)

Bug: http://b/33926793
Test: mm, boot, run bionic-unit-tests --gtest_filter=prop*
Change-Id: Iac6290398ddc495e03f8fbbc3a79e923eff5df6f