Add new modules/filesets from rsa2elk for 7.10 (#20820) (#21129)

This the following new modules:
- citrix (netscaler fileset): This existed in 7.9 but was removed by #20706.
- cyberark (corepass fileset).
- proofpoint (emailsecurity fileset).
- snort (log fileset).
- symantec (endpointprotection fileset).

And the following filesets to existing modules:
- barracuda/spamfirewall
- cisco/meraki
- f5/bigipafm
- fortinet/fortimail
- fortinet/fortimanager
- juniper/netscreen
- sophos/utm

(cherry picked from commit 3390aa8)

CHANGELOG.next.asciidoc

@@ -491,6 +491,18 @@ field. You can revert this change by configuring tags for the module and omittin
 - Add replace_fields config option in add_host_metadata for replacing host fields. {pull}20490[20490] {issue}20464[20464]
 - Add container ECS fields in kubernetes metadata. {pull}20984[20984]
 - Add ingress controller dashboards. {pull}21052[21052]
+- Added experimental `citrix` module. {pull}20820[20820]
+- Added experimental `cyberark` module. {pull}20820[20820]
+- Added experimental `proofpoint` module. {pull}20820[20820]
+- Added experimental `snort` module. {pull}20820[20820]
+- Added experimental `symantec` module. {pull}20820[20820]
+- Added experimental dataset `barracuda/spamfirewall`. {pull}20820[20820]
+- Added experimental dataset `cisco/meraki`. {pull}20820[20820]
+- Added experimental dataset `f5/bigipafm`. {pull}20820[20820]
+- Added experimental dataset `fortinet/fortimail`. {pull}20820[20820]
+- Added experimental dataset `fortinet/fortimanager`. {pull}20820[20820]
+- Added experimental dataset `juniper/netscreen`. {pull}20820[20820]
+- Added experimental dataset `sophos/utm`. {pull}20820[20820]
 
 *Auditbeat*