syncbase: Expose Collection ACLs in Watch.

Implement API from v.io/c/23042 .
Collection creations and permissions changes are propagated to the
client with appropriate CollectionInfo, as well as collection destroys.

Collection updates were hooked up end-to-end in Go. Only row updates are
propagated in Java and Cgo for now.

Also factored out collection perms key parsing.

MultiPart: 1/2
Change-Id: Ibe05257f1b96e6eb08f7c3090924bb791bb8a919
5 files changed