Drop list of return values to be ignored in AdminTool
This was an attempt to suppress client uninstallation failure
messages in the server uninstallation script. This method
inadvertently also suppressed client uninstallation messages and
was generally confusing.
This reverts part of b96906156be37a7b29ee74423b82f04070c84e22
https://pagure.io/freeipa/issue/7836
Signed-off-by: Rob Crittenden <rcritten@redhat.com>