Add CBT enable, disable calls to Storage_impl_test
Add CBT enable, disable calls to Storage_impl_test

With "assert false" stubs, as we don't have tests for these calls in
Storage_impl_test at the moment, so they shouldn't get called.

Signed-off-by: Gabor Igloi <7535f5501fd71876c93d896691e178fd3a11cfbb@citrix.com>

euanh/xen-api,euanh/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,srowe/xen-api,euanh/xen-api,euanh/xen-api