Intermittant validation lab download failure

Matt saw this:

> make[4]: Entering directory `/scratch/cbuild/slave/slaves/tcpanda02'
> make -s -f ../../lib/fetch.mk
> gcc-linaro-4.7-2012.08/gcc-linaro-4.7-2012.08.tar-spawn 2>&1 | grep -v
> '^make\['
> Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.tar.xz
> Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.tar.xz
> Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7-2012.08.tar.xz
> Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7-2012.08.tar.xz
> Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.tar.bz2
> Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7/gcc-linaro-4.7-2012.08.tar.bz2
> Trying http://builds.linaro.org/toolchain/snapshots/gcc-linaro-4.7-2012.08.tar.bz2
> Trying http://ex.seabright.co.nz/snapshots/gcc-linaro-4.7-2012.08.tar.bz2
> bunzip2: gcc-linaro-4.7-2012.08/gcc-linaro-4.7-2012.08.tar.bz2: data integrity (CRC) error in data

The test correctly detected a bad download. ex.seabright is the authoritative source. Perhaps the proxy got in the way?

Logged to track any other occurrences.