gfsh command succeeds even with an invalid argument/option

With the removal of joptsimple GEODE-835, gfsh command does not fail with an invalid argument. The following command succeeds, but should have failed as foo is not a valid argument:

gfsh>start locator foo --name=loc1

The following command also succeeds, but should have failed as --bar is not a valid option:

gfsh>start locator foo --name=loc2 --bar --port=10335