RFE: Display entire argument string in execsnoop output

Execsnoop is by far one of the best utilities ever dreamed up. Any way to enhance the script to print the entire argument list passed to the program? This would have been super helpful while debugging [this](http://prefetch.net/blog/index.php/2016/10/07/ganglia-never-met-a-quote-it-didnt-like-wait-it-did/). I'm hoping to learn enough about bcc this weekend to write a DTraceToolkit rwsnoop replacement. That was another crazy useful utility for debugging problems.

Start at the execsnoop entry point in bcc and inspect how its current argument output is assembled. Done means the output includes the entire argument list passed to each program, using the existing execsnoop behavior as the comparison.

Written by the indexing model from the issue text.