touch up test_cmdline_python_namespace_package() test code
touch up test_cmdline_python_namespace_package() test code

markshao/pytest,txomon/pytest,hackebrot/pytest,davidszotten/pytest,pytest-dev/pytest,tareqalayan/pytest,pfctdayelise/pytest,Akasurde/pytest,nicoddemus/pytest,RonnyPfannschmidt/pytest,tomviner/pytest,tomviner/pytest,rmfitzpatrick/pytest,alfredodeza/pytest,The-Compiler/pytest,ddboline/pytest,nicoddemus/pytest,The-Compiler/pytest