[New Integration] Add support for Aruba network device logs

[narph]

Integration release checklist

Logs are syslogs, with the message part looking like this:

"message" => "<142>Feb 3 09:37:00 sw-tes-03-rack2 00179 mgr: ST1-CMDR: SME SSH from 10.56.12.21 - MANAGER Mode", "message" => "<142>Feb 3 09:38:58 sw-tes-03-rack2 03362 auth: ST1-CMDR: User 'test' logged in from 10.56.12.21 to SSH session", "message" => "<142>Feb 3 09:39:00 sw-tes-03-rack2 00179 mgr: ST1-CMDR: SME SSH from 10.56.12.21 - MANAGER Mode", "message" => "<142>Feb 3 09:39:06 sw-tes-03-rack2 03363 auth: ST1-CMDR: User 'test' logged out of SSH session from 10.56.12.21", ....

All changes

• [ ] Change follows the contributing guidelines
• [ ] Supported versions of the monitoring target are documented
• [ ] Supported operating systems are documented (if applicable)
• [ ] Integration or System tests exist
• [ ] Documentation exists, useful guidelines to follow
• [ ] Fields follow ECS and naming conventions
• [ ] At least a manual test with ES / Kibana / Agent has been performed.
• [ ] Required Kibana version set to:

cc @jamiehynds

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[jamiehynds]

Meeting with Aruba partner this week, who may be willing to give us access to sample data to unblock us from building Aruba integrations.

[qcorporation]

@jamiehynds @cpascale43 Looking to get some further details about:

• Setup for the engagement: are we to support this integration with a virtual appliance install, or will it require hardware
• Can we get sample data for our Eng teams, and if so, where are these stored?
• Timelines for when we want to target delivery of this integration