[table service] Intercepted storage server channel should shutdown the underlying managed channel

[sijie]

Descriptions of the changes in this PR:

Motivation

When a storage server channel is intercepted, the underlying channel will not be ManagedChannel
any more. so closing storage server channel will never close the underlying managed channel.

Changes

StorageServerChannel#intercept should keep reference to the original storage server channel.
so when closing the intercepted channel, it can close the original channel.

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[sijie]

rebuild java8