Fixed small grammar error in comment, moved two vars out of global scope, added more informative mlab-ns failure logging.
Fixed small grammar error in comment, moved two vars out of global scope, added more informative mlab-ns failure logging.

m-lab/m-lab.github.io,m-lab/m-lab.github.io,m-lab/m-lab.github.io,critzo/m-lab.github.io,critzo/m-lab.github.io,m-lab/m-lab.github.io,critzo/m-lab.github.io,critzo/m-lab.github.io