Checkbox touchpad tests will be skipped if chassis type is "Convertible"

Test image: sutton-newton2-xenial-amd64-20170424-0.iso
Test machine: Newton2-4(Lenovo Yoga 11e)
CPU: Intel(R) Celeron(R) CPU N3450 1.10GHz
GPU: Intel Corporation Device 5a85 (rev 0b)
BIOS: R0KET25W (1.11 )

Steps to reproduce:
1. Install image on Newton2-4
2. Boot system and log in
3. Try all functions of touchpad
4. '$ sudo evtest' and select number 5 to verify
5. '$ sudo dmidecode' to found 'Built-in Pointing Device', 'Notebook' or 'Laptop'
6. Install checkbox on Newton2-4
7. Execute checkbox and run touchpad related test cases

Actual result:
The functions of touchpad are good;
Command evtest can capture the behavior of touchpad;
Can not find 'Built-in Pointing Device', 'Notebook' or 'Laptop' string via command dmidecode;
Touchpad test cases are skipped.

Expect result:
There should be 'Notebook' or 'Laptop' string via command dmidecode, so that checkbox can find the device and do related test for touchpad
Touchpad test cases should be executed one by one.