s390x: Ultravisor guest API test

Test the error conditions of guest 2 Ultravisor calls, namely:
     * Query Ultravisor information
     * Set shared access
     * Remove shared access

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200810154541.32974-1-frankja@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>