* port resource: support ss instead of netstat
`netstat` is officially deprecated and is replaced with `ss`. This PR
changes the port resource to use `ss` if it's available on the target
system.
Signed-off-by: Adam Leff <adam@leff.co>
* Disable Metrics/ClassLength cop on the LinuxPorts class
Signed-off-by: Adam Leff <adam@leff.co>