Description of problem:
user-del --continue does not skip error as expected.

Version-Release number of selected component (if applicable): ipa-server 1.9
ipa-server-selinux-1.91-0.2010113020git94957c8.fc13.i686
ipa-server-1.91-0.2010113020git94957c8.fc13.i686


How reproducible: always


Steps to Reproduce:
1. list all current users
[yi@mv32a-vm ~]$ ipa user-find test | grep "User login"
  User login: testuser11948
  User login: test123
  User login: testuser001
  User login: testuser002

2. run command: (please note: user test001 and test002 does not exist)
[yi@mv32a-vm ~]$ ipa user-del --continue test001 testuser001 test002 testuser002
ipa: ERROR: test001: user not found

3. --continue option should skip error but not
[yi@mv32a-vm ~]$ ipa user-find test | grep "User login"
  User login: testuser11948
  User login: test123
  User login: testuser001
  User login: testuser002