Remove IoT sample category
Remove IoT sample category

[Issue] https://github.com/Samsung/WATT/issues/150
[Problem] Currently there is no sample from IoT category
[Solution] Remove whole category

Signed-off-by: Pawel Kaczmarczyk <b7effdadda38689a3aaf68b905c3581fe1a9d784@samsung.com>

HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT,HunseopJeong/WATT