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User can use this optional parameter to get the information of specific vhost controller. Change-Id: I3911c6c7d4e7b75e82277d1e4690d5e40019aa06 Signed-off-by: wuzhouhui <wuzhouhui@kingsoft.com> Reviewed-on: https://review.gerrithub.io/425451 Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> Chandler-Test-Pool: SPDK Automated Test System <sys_sgsw@intel.com> Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>