Make os and os.path imports a bit more readable
Make os and os.path imports a bit more readable

Repeating the os.path. prefix on all the method calls makes
the lines long and less easy to read.

Import only the specific methods that are needed.

Change-Id: Ib6cce24213e282f2364806f70ada69f0f3c82a16

tescalada/pydocstyle,jmullan/pep257,farmersez/pydocstyle,GreenSteam/pep257,Nurdok/pep257,pombredanne/pep257,codehs/pep257,PyCQA/pydocstyle,jbeezley/pep257,bagelbits/pep257,bartvm/pep257,glennmatthews/pep257,jayvdb/pep257,Nurdok/pydocstyle,13steinj/pep257