make fake_servistry_bbs synchronous

Signed-off-by: Phan Le <ple@pivotallabs.com>
service package contains shared service interface and common service components

Signed-off-by: Phan Le <ple@pivotallabs.com>
GetAvailableCC returns set of registered CC urls

Signed-off-by: Phan Le <ple@pivotallabs.com>