Fix issue where dontMock()ing one node_modules dep mocks all of them

There were two issues here:

1. We had modulePathIgnorePatterns defaulting to `['/node_modules/']` (a mistakely checked in debug artifact from a recent commit)
2. We weren't properly searching for node_modules dependencies inside of HasteModuleLoader._getNormalizedModuleID(), so it wound up normalizing all node_modules dependencies with the same normalized id.