Add option to export env variables to daemon

[exowaucka]

This change allows environment variables to be exported in the sysv init script. This allows /etc/default/$name or /etc/sysconfig/$name to function in a manner similar to systemd (minus the end-user's ability to set whatever environment variables they want).

The motivation for this change is to allow NODE_OPTIONS to be specified in /etc/default/kibana for the Kibana 4 Debian/Ubuntu packages, even when using sysvinit. (There are still some supported versions of Ubuntu with sysvinit.)

[jordansissel]

Curious. Why not export from your default/sysconfig file?

[exowaucka]

Blindly exporting everything in the default/sysconfig file to the daemon itself (not just the init script) seem dangerous to me.

[BOSTONMIKE101876]

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