Update TLS protocol to use ECS fields

That dashboards were updated too. There weren't many changes needed w.r.t. fields
but I did update the visualizations and saved searches to include `[Packetbeat]` in their
names.

I added a python test case for TLS and discovered a few fields that were not documented
so I updated the fields docs accordingly.

Here's a summary of what fields changed.

Part of elastic#7968

Changed

- responsetime -> event.duration (unit are now nanoseconds)

Added

- event.dataset = tls
- event.end
- event.start
- network.community_id
- network.protocol = tls
- network.type
- source.domain (added if there's a SNI value)

Unchanged Packetbeat Fields

- status
- type = http (we might remove this since we have event.dataset)

CHANGELOG.next.asciidoc

@@ -43,6 +43,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
   - `http.response.body` moves to `http.response.body.content`
 - Changed DNS protocol fields to align with ECS. {pull}9941[9941]
 - Removed trailing dot from domain names reported by the DNS protocol. {pull}9941[9941]
+- Changed TLS protocol fields to align with ECS. {pull}9980[9980]
 
 *Winlogbeat*
 

packetbeat/_meta/beat.docker.yml

@@ -33,3 +33,6 @@ packetbeat.protocols.mongodb:
 packetbeat.protocols.cassandra:
   ports: [9042]
 
+packetbeat.protocols.tls:
+  ports: [443, 993, 995, 5223, 8443, 8883, 9243]
+

packetbeat/_meta/beat.reference.yml

@@ -444,7 +444,14 @@ packetbeat.protocols:
 
   # Configure the ports where to listen for TLS traffic. You can disable
   # the TLS protocol by commenting out the list of ports.
-  ports: [443]
+  ports:
+    - 443   # HTTPS
+    - 993   # IMAPS
+    - 995   # POP3S
+    - 5223  # XMPP over SSL
+    - 8443
+    - 8883  # Secure MQTT
+    - 9243  # Elasticsearch
 
   # List of hash algorithms to use to calculate certificates' fingerprints.
   # Valid values are `sha1`, `sha256` and `md5`.

packetbeat/_meta/beat.yml

@@ -100,7 +100,14 @@ packetbeat.protocols:
 - type: tls
   # Configure the ports where to listen for TLS traffic. You can disable
   # the TLS protocol by commenting out the list of ports.
-  ports: [443]
+  ports:
+    - 443   # HTTPS
+    - 993   # IMAPS
+    - 995   # POP3S
+    - 5223  # XMPP over SSL
+    - 8443
+    - 8883  # Secure MQTT
+    - 9243  # Elasticsearch
 
 #==================== Elasticsearch template setting ==========================