JetBrains Upsource using systemd as a 'run' script

When Upsource was first installed a forking style systemd.service file was used. This has a few issues with getting logging/error information and setting up pid files correctly. This updated configuration file uses a simple systemd.service configuration file (and no pid file).

The key change is to use the 'run' option from the JetBrains supplied upsource script.

[Unit]
Description=JetBrains Upsource
Requires=network.target
After=syslog.target network.target

[Service]
Type=simple
EnvironmentFile=/etc/sysconfig/upsource
ExecStart=/srv/upsource/upsource/bin/upsource.sh run
ExecStop=/srv/upsource/upsource/bin/upsource.sh stop
ExecReload=/srv/upsource/upsource/bin/upsource.sh rerun
User=upsource

[Install]
WantedBy=multi-user.target