rest: add example test code
rest: boot configuration for device
rest: boot configuration for device
rest: create new model (Host). Device is now subclass for Host.
rest: add boot configurations resources
rest: relocate code of boot configuration to Host class
rest: test file for boot configurations resources
rest: relocate test code
rest: refactor
rest: update ldap_map list for LtspServer and change super class to Host.
rest: test for Host model
rest: fix variable name
rest: boot configuration for unregistered device
rest: add default kernel arguments
rest: no kernel arguments if device is unregistered