Adds SoftwareProcess.SSH_ADDRESS (user@ip:port)

- particularly useful for docker, where the ssh port is mapped so
  no each way of finding out that port otherwise
PR #1430 comments: sensor for sshable user@host:port

- adds UserAndHostAndPort
- Attributes.SSH_ADDRESS of type UserAndHostAndPort instead of string
- removed SSH_ADDRESS from SoftwareProcess (so it’s just a dynamically
  added attribute)
Merge pull request #1430 from aledsage/minor/add-sshAddress-to-softwareProcess

Adds SoftwareProcess.SSH_ADDRESS (user@ip:port)