Improve message about refused to resubmit jobs.

Previous message :
```
[jbalcas@lxplus0042 src]$ crab resubmit test_retry/crab_test-retry1/ --jobids=2
Resubmit request successfully sent
Cannot request resubmission for [2]
```
New message
```
[jbalcas@lxplus0042 src]$ crab resubmit test_retry/crab_test-retry1/ --jobids=2
Resubmit request successfully sent
CRAB3 server refused to resubmit these jobs: [2]. You cannot resubmit these jobs if they are running
```