[CI] Enable integration tests on CPU

Author: leezu

ci/jenkins/Jenkinsfile_py3_cpu_unittest

@@ -54,6 +54,14 @@ core_logic: {
                               'scripts/tests', 'src/gluonnlp',
                               'not (gpu or integration) and serial',
                               0, false, false)
+    build_steps.test_unittest('gluon-nlp-cpu-py3', 'cpu/py3',
+                              'scripts/tests', 'src/gluonnlp',
+                              'not (gpu or serial) and integration',
+                              4, false, false),
+    build_steps.test_unittest('gluon-nlp-cpu-py3', 'cpu/py3',
+                              'scripts/tests', 'src/gluonnlp',
+                              '(not gpu) and serial and integration',
+                              0, false, false)
   ])
 }
 ,