The vhost tests create some temporary files as they run outside of the SPDK repostiroy. Clean these up. Change-Id: Ic964fc6672b8a4ea088ace1b11c712eb70f7be08 Signed-off-by: Ben Walker <benjamin.walker@intel.com> Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/454933 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>