Pretty much all the changes from v1->v2 regarding REST semantics,
payload changes, etc have been completed.
So let's enable APIv2 in an experimental state. It will be needed for
exposing some new Sahara features like force-delete, decomission of
a specific node, and hopefully more.
bp v2-api-experimental-impl
Depends-On: I8397ed7c134f0742de8c38466ed3f9035d8103d4
Depends-On: I102fb2ad16d0256e3a9aa364586332a13826cc90
Change-Id: I6ee89d52ab6679c34f0a089df4b111796922e171