Added a utility library to read/write configs.

Fixes a bug where serializing protobufs was
not working, i.e. we were using API that is
appropriate only for the "-full" version of
protobuf. It's all fixed now though.

Change-Id: I47d1473393ae0a8af3041222c89fd0898c367081
Change-Id: I3d7112ef9b9f69a9d09d566f28fcebd9ef63d268
Merge branch 'jb-privacy' of https://github.com/nesl/platform_frameworks_native into jb-privacy