pass env variable to traffic_server via traffic_cop

[毅程]

Hi:

I am wondering how to pass
export LD_LIBRARY_PATH=xxx
to traffic_server via traffic_cop, since I am using bin/trafficserver to
start traffic server.

if I start by using bin/traffic_server, I can export LD_LIBRARY_PATH=xx
directly and it works, but I am using trafficserver script, I do not know
how.

Many Thanks.

Cheng Yi