perf: Align output of transport statistics

It'll make output more readable and align all
transports output

Signed-off-by: Alexey Marchuk <alexeymar@mellanox.com>
Change-Id: I9ac420ffd947ed433ebefec50e7c287ddf2eb344
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/9162


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Broadcom CI <spdk-ci.pdl@broadcom.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Dong Yi <dongx.yi@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@gmail.com>