patch to bring ndt-support to 3.6.5.2

Removes unnecessary patch, web100-pcap.c, and cleans up build steps in prepare.sh thanks to the new tar package for the ndt source.

As well, no svn-modules are needed, and I2util is bundled with the ndt source package now.

This patch is sufficient to build an m-lab package for deployment testing to mlab4's.