Update jenkins (#890)

Jenkinsfile

@@ -5,7 +5,7 @@
 
 // tvm libraries
 tvm_runtime = "lib/libtvm_runtime.so, config.mk"
-tvm_lib = "lib/libtvm.so " + tvm_runtime
+tvm_lib = "lib/libtvm.so, " + tvm_runtime
 // LLVM upstream lib
 tvm_multilib = "lib/libtvm_llvm40.so, lib/libtvm_llvm50.so, lib/libtvm_llvm60.so, lib/libtvm_topi.so, " + tvm_runtime
 
@@ -217,7 +217,7 @@ stage('Unit Test') {
     }
   },
   'cpp': {
-    node('linux') {
+    node('CPU' && 'linux') {
       ws('workspace/tvm/ut-cpp') {
         init_git()
         unpack_lib('cpu', tvm_lib)