Add 21 autogenerated filesets from rsa2elk devices (elastic#19713)

This adds the following experimental filesets based on Apache 2 license
device parsers:

- tomcat.log
- netscout.sightline
- barracuda.waf
- f5.bigipapm
- bluecoat.director
- cisco.nexus
- citrix.virtualapps
- cylance.protect
- f5.firepass
- fortinet.clientendpoint
- imperva.securesphere
- infoblox.nios
- juniper.junos
- kaspersky.av
- microsoft.dhcp
- tenable.nessus_security
- rapid7.nexpose
- radware.defensepro
- sonicwall.firewall
- squid.log
- zscaler.zia

CHANGELOG.next.asciidoc

@@ -441,6 +441,27 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Improve ECS categorization field mappings in traefik module. {issue}16183[16183] {pull}19379[19379]
 - Improve ECS categorization field mappings in azure module. {issue}16155[16155] {pull}19376[19376]
 - Add text & flattened versions of fields with unknown subfields in aws cloudtrail fileset. {issue}18866[18866] {pull}19121[19121]
+- Add experimental dataset tomcat/log for Apache TomCat logs {pull}19713[19713]
+- Add experimental dataset netscout/sightline for Netscout Arbor Sightline logs {pull}19713[19713]
+- Add experimental dataset barracuda/waf for Barracuda Web Application Firewall logs {pull}19713[19713]
+- Add experimental dataset f5/bigipapm for F5 Big-IP Access Policy Manager logs {pull}19713[19713]
+- Add experimental dataset bluecoat/director for Bluecoat Director logs {pull}19713[19713]
+- Add experimental dataset cisco/nexus for Cisco Nexus logs {pull}19713[19713]
+- Add experimental dataset citrix/virtualapps for Citrix Virtual Apps logs {pull}19713[19713]
+- Add experimental dataset cylance/protect for Cylance Protect logs {pull}19713[19713]
+- Add experimental dataset f5/firepass for F5 FirePass SSL VPN logs {pull}19713[19713]
+- Add experimental dataset fortinet/clientendpoint for Fortinet FortiClient Endpoint Protection logs {pull}19713[19713]
+- Add experimental dataset imperva/securesphere for Imperva Secure Sphere logs {pull}19713[19713]
+- Add experimental dataset infoblox/nios for Infoblox Network Identity Operating System logs {pull}19713[19713]
+- Add experimental dataset juniper/junos for Juniper Junos OS logs {pull}19713[19713]
+- Add experimental dataset kaspersky/av for Kaspersky Anti-Virus logs {pull}19713[19713]
+- Add experimental dataset microsoft/dhcp for Microsoft DHCP Server logs {pull}19713[19713]
+- Add experimental dataset tenable/nessus_security for Tenable Nessus Security Scanner logs {pull}19713[19713]
+- Add experimental dataset rapid7/nexpose for Rapid7 Nexpose logs {pull}19713[19713]
+- Add experimental dataset radware/defensepro for Radware DefensePro logs {pull}19713[19713]
+- Add experimental dataset sonicwall/firewall for Sonicwall Firewalls logs {pull}19713[19713]
+- Add experimental dataset squid/log for Squid Proxy Server logs {pull}19713[19713]
+- Add experimental dataset zscaler/zia for Zscaler Internet Access logs {pull}19713[19713]
 
 *Heartbeat*