Fix integration issues

[clyang82]

fix some issues in integration test:

1. use random consumer name to avoid the potential influence
2. remove workagent to fix the error

       Expected success, but got an error:
           <*errors.errorString | 0xc000e4b540>:
           should have 150 update status events but got 156
           {
               s: "should have 150 update status events but got 156",
           }
   --- FAIL: TestControllerRacing (15.30s)

3. wait for 3 seconds to ensure the controller manager and status controller start to work to avoid the error

   Expected success, but got an error:
           <*errors.errorString | 0xc0011f5210>:
           should have only 50 create events but got 49
           {
               s: "should have only 50 create events but got 49",
           }