Add a python clean.sh script
Add a python clean.sh script

A script to clean out installed dependencies so I don't use the one in
twitter commons or pantsbuild.

Testing Done:
It works?

Reviewed at https://reviews.apache.org/r/22747/

medallia/aurora,mschenck/aurora,mkhutornenko/incubator-aurora,mkhutornenko/incubator-aurora,wfarner/aurora,mschenck/aurora,protochron/aurora,wfarner/aurora,thinker0/aurora,mschenck/aurora,crashlytics/aurora,thinker0/aurora,medallia/aurora,medallia/aurora,medallia/aurora,wfarner/aurora,rosmo/aurora,kidaa/aurora,protochron/aurora,apache/aurora,mschenck/aurora,apache/aurora,medallia/aurora,protochron/aurora,rdelval/aurora,mkhutornenko/incubator-aurora,rosmo/aurora,apache/aurora,crashlytics/aurora,rdelval/aurora,kidaa/aurora,protochron/aurora,rdelval/aurora,shahankhatch/aurora,mkhutornenko/incubator-aurora,mschenck/aurora,shahankhatch/aurora,medallia/aurora,thinker0/aurora,kidaa/aurora,rosmo/aurora,rosmo/aurora,apache/aurora,kidaa/aurora,rdelval/aurora,kidaa/aurora,wfarner/aurora,crashlytics/aurora,rosmo/aurora,rdelval/aurora,apache/aurora,shahankhatch/aurora,crashlytics/aurora,apache/aurora,thinker0/aurora,mschenck/aurora,shahankhatch/aurora,protochron/aurora,wfarner/aurora,protochron/aurora,rdelval/aurora,rosmo/aurora,crashlytics/aurora,wfarner/aurora,mkhutornenko/incubator-aurora,crashlytics/aurora,shahankhatch/aurora,thinker0/aurora,kidaa/aurora,shahankhatch/aurora,thinker0/aurora