trex_stateless: add rpc proxy info/usage
trex_stateless: add rpc proxy info/usage

kisel/trex-core,dimagol/trex-core,dimagol/trex-core,dimagol/trex-core,dimagol/trex-core,kisel/trex-core,kisel/trex-core,kisel/trex-core,kisel/trex-core,dimagol/trex-core,kisel/trex-core,dimagol/trex-core