Begin adding v3 api support

Create the v3 directory and populate it with some of the basic
files from v2 that will be needed.  These files are straight
copies so that v3-specific changes will be easier to see in
subsequent changes.

Extensions will be added individually in future changes.

bp v3-api

Change-Id: I9538c70ccc6fb001ce2fd43ccfd41870f247c67e
Enable v3 api code

Add mappings to enable v3 code

bp v3-api

Change-Id: I035e5b9d65c06ce5691573832bb9b6c4c705b121
Merge "Begin adding v3 api support"
Merge "Enable v3 api code"