Allow selector in the eventtailer config

[aslafy-z]

Is your feature request related to a problem? Please describe.
In big clusters, tailing all events might be too much.

Describe the solution you'd like
Include/Exclude namespaces by using selectors

[pepov]

@aslafy-z are you still using the event tailer extension?

[aslafy-z]

@pepov yes I do