Skipping labkey start install-script step does not enable tomcat service

[labkey-stuartm]

The start labkey function does two things - enable the service and start the service.
If you choose the skip this step during installation, the tomcat service will not be enabled so that it starts on reboots.

We should move the enable command to the service create step.

function step_start_labkey() {
  if _skip_step "${FUNCNAME[0]/step_/}"; then return 0; fi
  \# Enables the tomcat service and starts labkey
  sudo systemctl enable tomcat_lk.service
  sudo systemctl start tomcat_lk.service
}