Renaming default 'vmc' client in the uaadb to 'cf'

[pkury...@pivotallabs.com]

The UAA has long contained a default oauth client called 'vmc'.  We're now changing the name of this client to 'cf', in order to keep up with current documentation and naming.  Services that rely on the old 'vmc' client id should expect to use 'cf' in upcoming releases of the Login Server and UAA.