Update test to include -nl on the execution command line when it is nonzero
Update test to include -nl on the execution command line when it is nonzero

The test io/ferguson/utf8cols/widecols.chpl has its own sub_test, but wasn't
setting -nl for multilocale testing. Grab the value out of the NUMLOCALES
environment variable and set it on the execution command.

[Reviewed by mppf]


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@21019 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

sungeunchoi/chapel,sungeunchoi/chapel,chizarlicious/chapel,hildeth/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,hildeth/chapel