Rudder

We would like to extend Rudder so that arbitrary tags can be defined on nodes, in order to classify them better.

These tags would be key=value pairs, where the value is optional (just "key" is fine). Both key and value must respect the regex [a-zA-Z0-9_]+ (this ensures compatibility with CFEngine vars and classes names).

1. Add a UI section to the "Node details" view to be able to add and delete tags on a node
2. Add a search component so that searches and groups can query nodes based on their tags (tag X is defined, tag X has value Y, tag X has value Y.*Z...)
3. Add a UI tool in the "List nodes" page to be able to select multiple groups and mass-apply a tag to them

Note: these changes may be separated out into several User Stories in this ticket tracker if necessary.

Attached is a photo of possible UI specs.