zabbix config initialization in ZabbixApiClient (nc-195)
ZabbixApiClient initialization in tasks corrected (nc-195)
default values for interface_parameters and default_service_parameters (nc-195)
do not send uuid to tasks (zabbix tasks) (nc-195)
tasks calls only with json-serializable objects (nc-195)
baclup models tests correction (nc-195)
use uuid.hex instead of str(uuid) (nc-195)
log exceptions if any of backup tasks was called with unsuitable uuid (nc-195)
check that backup source is not None added and backup task renamed (nc-195)
Merge branch 'feature/nc-195' into 'develop'

Feature/nc 195
backup task renamed in models.py (nc-195)
Merge branch 'develop' of code.opennodecloud.com:nodeconductor/nodeconductor into develop