Accept additional -tsung_controller options in tsung.sh

[dimp-gh]

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Hi.

Thanks for putting together Tsung, it's a wonderful load testing tool.

For the purpose of test stats analysis, it would be good to have a possibility to pass additional options to Tsung controller (like adding -tsung_controller dumpstats_interval 1000 to make Tsung dump stats to tsung.log every second). Right now the only way to do that is to modify Tsung shell script at /usr/bin/tsung, which isn't exactly suitable for many situations.

[dimp-gh]

Oh, and by the way, tsung.sh allows user to perform a shell variable injection through warm-time option to pass additional arguments to tsung controller.

Example:

tsung -f http_simple.xml -w "0 -tsung_controller dumpstats_interval 1000" start