fix test script bug

tests/pytest/wal/sdbComp.py

@@ -83,7 +83,8 @@ class TDTestCase:
         os.system("nohup %s/taosd  --compact-mnode-wal  -c %s/sim/dnode1/cfg/ & " %(binPath,testPath) )
         # os.system("nohup taosd  --compact-mnode-wal  -c %s/sim/dnode1/cfg/ & " % testPath )
         # tdDnodes.start(1)
-        os.system("nohup %s/taosd -c %s/sim/dnode1/cfg > /dev/null 2>&1 &" %(binPath,testPath) )
+        #os.system("nohup %s/taosd -c %s/sim/dnode1/cfg > /dev/null 2>&1 &" %(binPath,testPath) )
+        tdDnodes.start(1)
         sleep(4)
         tdSql.execute("reset query cache")
         query_pid2 = int(subprocess.getstatusoutput('ps aux|grep taosd |grep -v "grep"|awk \'{print $2}\'')[1])