Add Slack notification support. about honeytrap

[nl5887]

the configuration (in toml format) already has other channels (elasticsearch and honeytrap) configured. Here we can add Slack as well. Due to the nature of the messages, we need to filter per channel the type of messages (by regular expression) that will pass the channel. This allows us to have only high level notifications to Slack, and detail information to Elasticsearch.

[influx6]

Updated the issue to be precise, I was under the assumption we were building to get notifications from slack but it's clearer we want to make notifications to slack and do it on a per channel and message type basis.

[influx6]

Breakdown

• Add Slack message delivery as is describe in issue #2

• Add Slack filtering by message type as describe in issue #4

• Add Slack filtering by message channel as is describe in issue #3

[influx6]

Merged into restructure