Fix minor issues with the tutorial
Fix minor issues with the tutorial

* Tutorial nicely provides URL for scheduler, unfortunately it is pointing at the wrong host.
* Correct python executable name

Reviewed at https://reviews.apache.org/r/18306/

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