In short, the tableacl configuration will be represented as a
tableacl.proto. tableacl module holds a global "currentACL" instance
which maps a table group to its ACLs.
1. Introduce tableacl.proto which defines acl per table group.
A table group either contains only one table or many tables
that share the same name prefix.
2. Remove "All" and "AllString" funcs from acl.Factory interface.
Shengzhe Yao