test fix: no assertion on the number of fileds returned

Removed the assertion on the number of fields from ReflectUtil because it did not work with bytecode manipulation like what sonar works with.

Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
LOUDSTACK-4060: UI > Instance Wizard > select security group step > when there is only one security group and the only one is 'default', check it automtically.