fix: replace deprecated `iteritems` with `items`
* Add files via upload
Adjusted *.iteritems() to *.items() which will work for Python 3 aswell as Python 2 (since iteritems is outdated for python3 and breaks the salt-state).
* Delete Alerts
* Delete Probes
* Delete Targets
* Update Alerts
* Update Probes
* Update Targets