Simplify application management and align with other docker applications

The notion of application "instances" is dropped in favor of a simpler,
single-instance approach. Default values are provided for all configuration
variables so allow the app to run without additional manual configuration.

A health check and auto-heal script are added to automatically restart the
application in case it becomes unavailable during operation.

root/etc/systemd/system/streamline-emr.service

@@ -1,14 +1,16 @@
 [Unit]
 Description=Run Streamline EMR
-After=network.target
-StartLimitIntervalSec=0
+Requires=docker.service
+After=docker.service
 
 [Service]
-Type=simple
-Restart=always
-RestartSec=10
+Type=oneshot
+RemainAfterExit=yes
 User=root
-ExecStart=/var/signalytic/clientapps/streamline/streamline-emr/entry
+WorkingDirectory=/var/signalytic/clientapps/streamline/streamline-emr
+ExecStart=/var/signalytic/clientapps/streamline/streamline-emr/start
+ExecStop=/var/signalytic/clientapps/streamline/streamline-emr/stop
+TimeoutStartSec=0
 
 [Install]
 WantedBy=multi-user.target