cluster: remove the useless parameter for master
It seems that at 'RoundRobinHandle', the 'addressType' isn't used but just used at 'SharedHandle', so remove this useless parameter and its related files.
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines