Add support for nonetdata group to exclude host from installing netdata

tasks/main.yml

@@ -50,4 +50,4 @@
         recurse: yes
         follow: no
 
-  when: not excluded_roles or "netdata" not in excluded_roles
+  when: (not excluded_roles or "netdata" not in excluded_roles) and (groups['nonetdata'] is not defined or inventory_hostname not in groups['nonetdata'])