pom.xml: don't multithread testng
pom.xml: don't multithread testng

We have a bug in our tests that prevents some suites to run together. We should fix this.

Signed-off-by: Cole Ott <c40dbb01a0ae2ed2db5ce64b57b4492867839e53@ning.com>

pierre/collector,ning/collector,pierre/collector,ning/collector,ning/collector,ning/collector,pierre/collector,pierre/collector,pierre/collector,ning/collector,pierre/collector