Reorganize osx environments to avoid repetition as suggested in review
Reorganize osx environments to avoid repetition as suggested in review

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