Hello.

If ssh credentials used with a passphrase, then Jenkins unable to fetch anything from the remote repo.

Step to reproduce:

1. Create a key with passphrase `ssh-keygen -b 2048 -t rsa -f test_rsa`
2. Add credentials 'SSH Username with private key' from the previous step
3. Add repo on git with access by the key
4. Create freestyle project with ssh git source and using credentials
   Result:
5. Remove passphrase from the key with `ssh-keygen -pf test_rsa`
6. Edit credentials regarding
7. Try to fetch the source code again
   Result:
    

I would like to give any necessary additional information.