Specify a shell when starting the service.

[runephilosof]

To allow using a system user.

[jbarbuto]

👍 please merge, without this the newrelic system user created by the newrelic-sysmond deb package can't start the plugin.

[jbarbuto]

The only catch being that -s isn't a valid option in freebsd.

[jostmart]

"This module installs, configures and manages as a service, New Relic Plugins on Debian/RHEL."

So is the problem with -s on FreeBSD a big problem?
I need the -s parameter to get it to start on Ubuntu LTS

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