Do not provide a default Pelion host address.
Do not provide a default Pelion host address.

This moves the default pelion host address to be assigned by the cloud
sdk. It also cleans up the logic a bit to be shorter.

kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed,kjbracey-arm/mbed,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed