ipatests: test_idp fails calling yum list wget
    
    On rawhide, the package wget has been replaced with wget2
    (more info in https://bugzilla.redhat.com/show_bug.cgi?id=2254790).
    
    The test test_idp is checking that the sudo command is working
    for a keycloak user, by creating a sudo rule for the yum command
    and calling sudo yum list wget.
    As the wget package does not exist any more on Rawhide, the command
    returns an error:
    Error: No matching Packages to list
    and the test fails.
    
    Replace the call "sudo yum list wget" with a call to "sudo yum list yum"
    as the yum package is always present.
    
    Fixes: https://pagure.io/freeipa/issue/9522
    
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>