Added testcase to check capitalization fix while running ipa user-mod
    
    1. This testcase checks that when ipa user-mod command is run with capital letters
    there is no error shown in the console, instead the modifications for first and last
    name of  the user is applied.
    
    2. Adding tasks.kinit_admin since the test was being executed as different user
    leading to permission issue.
    ipa: ERROR: Insufficient access: Could not read UPG Definition originfilter. Check your permissions
    
    Issue: https://pagure.io/freeipa/issue/5879
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Mohammad Rizwan Yusuf <myusuf@redhat.com>
    Reviewed-By: Francois Cami <fcami@redhat.com>