testsuite: add missing data check

Problem: In one python test, data is retrieved after an RPC
call but the data is never verified.

Call the helper function to verify the retrieved data.

Author: chu11

t/python/t0014-job-kvslookup.py

@@ -159,6 +159,7 @@ def test_info_00_job_info_lookup(self):
         data = rpc.get()
         self.check_jobspec_str(data, self.jobid1, 0)
         data = rpc.get_decode()
+        self.check_jobspec_decoded(data, self.jobid1, 0)
         self.assertEqual(data["id"], self.jobid1, 0)
 
     def test_info_01_job_info_lookup_keys(self):