Fix clock type in rpc_session timer (#2362)
Fix clock type in rpc_session timer (#2362)

* Fix clock type in rpc_session timer

* Fix lint error

sxjscience/tvm,tqchen/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,tqchen/tvm,tqchen/tvm,dmlc/tvm,tqchen/tvm,Laurawly/tvm-1,Laurawly/tvm-1,dmlc/tvm,dmlc/tvm,Huyuwei/tvm,tqchen/tvm,Huyuwei/tvm,sxjscience/tvm,tqchen/tvm,tqchen/tvm,sxjscience/tvm,Laurawly/tvm-1,Huyuwei/tvm,sxjscience/tvm,dmlc/tvm,Huyuwei/tvm,sxjscience/tvm,Huyuwei/tvm,dmlc/tvm,Huyuwei/tvm,sxjscience/tvm,Huyuwei/tvm,Laurawly/tvm-1,Huyuwei/tvm,sxjscience/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,Laurawly/tvm-1,dmlc/tvm,tqchen/tvm,dmlc/tvm,sxjscience/tvm,Huyuwei/tvm,sxjscience/tvm,dmlc/tvm,Laurawly/tvm-1,tqchen/tvm