added background models
fixed model typos
added user / group signal
added fields for background jobs
updated background job infrastructure
added TLS, signal local clusterserver
update of background job handling
model updates
only log error when local_device is not detectable
only show non-finished background jobs
use bootserver of master device when CD has not bootserver set (bootserver_hint)
fixed bug in routing, move uniqueness from config_name to config_(name, catalog)
added object_type to serializers
updated background job handling
send only one notify event to server
code cleanup
ignore migration bug in domain_tree_node system
fixed unicode issues
catch error when num_bg_jobs is not defined
remove unneeded import