Update low-level libraries to use //monitoring/streamz/public:core instead of //monitoring/streamz/public.
Update low-level libraries to use //monitoring/streamz/public:core instead of
//monitoring/streamz/public.

This breaks a dependency cycle due to CL 189787699 when built with
--nodistinct_host_configuration.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=189932147

GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java