[AIRFLOW-1716] Fix multiple __init__ def in SimpleDag
[AIRFLOW-1716] Fix multiple __init__ def in SimpleDag

Closes #2692 from MortalViews/master

subodhchhabra/airflow,nathanielvarona/airflow,artwr/airflow,mistercrunch/airflow,adamhaney/airflow,DinoCow/airflow,Fokko/incubator-airflow,wooga/airflow,Tagar/incubator-airflow,edgarRd/incubator-airflow,owlabs/incubator-airflow,dhuang/incubator-airflow,lyft/incubator-airflow,r39132/airflow,edgarRd/incubator-airflow,Acehaidrey/incubator-airflow,bolkedebruin/airflow,apache/incubator-airflow,mistercrunch/airflow,owlabs/incubator-airflow,sid88in/incubator-airflow,gtoonstra/airflow,hgrif/incubator-airflow,spektom/incubator-airflow,MortalViews/incubator-airflow,fenglu-g/incubator-airflow,dhuang/incubator-airflow,mrkm4ntr/incubator-airflow,OpringaoDoTurno/airflow,jgao54/airflow,danielvdende/incubator-airflow,edgarRd/incubator-airflow,OpringaoDoTurno/airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,MortalViews/incubator-airflow,sergiohgz/incubator-airflow,r39132/airflow,artwr/airflow,adamhaney/airflow,mrkm4ntr/incubator-airflow,subodhchhabra/airflow,cfei18/incubator-airflow,yati-sagade/incubator-airflow,Acehaidrey/incubator-airflow,gtoonstra/airflow,yk5/incubator-airflow,apache/incubator-airflow,lyft/incubator-airflow,yati-sagade/incubator-airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,jgao54/airflow,jfantom/incubator-airflow,OpringaoDoTurno/airflow,sergiohgz/incubator-airflow,owlabs/incubator-airflow,MortalViews/incubator-airflow,cjqian/incubator-airflow,fenglu-g/incubator-airflow,airbnb/airflow,airbnb/airflow,mrkm4ntr/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,andyxhadji/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,yati-sagade/incubator-airflow,gilt/incubator-airflow,cfei18/incubator-airflow,lxneng/incubator-airflow,lxneng/incubator-airflow,gilt/incubator-airflow,malmiron/incubator-airflow,fenglu-g/incubator-airflow,cjqian/incubator-airflow,cjqian/incubator-airflow,zack3241/incubator-airflow,wndhydrnt/airflow,spektom/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,gilt/incubator-airflow,gtoonstra/airflow,sekikn/incubator-airflow,zack3241/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,yk5/incubator-airflow,malmiron/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,KL-WLCR/incubator-airflow,cjqian/incubator-airflow,criccomini/airflow,wileeam/airflow,andyxhadji/incubator-airflow,artwr/airflow,RealImpactAnalytics/airflow,nathanielvarona/airflow,wolfier/incubator-airflow,wndhydrnt/airflow,subodhchhabra/airflow,KL-WLCR/incubator-airflow,Tagar/incubator-airflow,spektom/incubator-airflow,sergiohgz/incubator-airflow,andyxhadji/incubator-airflow,r39132/airflow,danielvdende/incubator-airflow,gilt/incubator-airflow,Tagar/incubator-airflow,apache/airflow,sekikn/incubator-airflow,wileeam/airflow,sekikn/incubator-airflow,sid88in/incubator-airflow,Fokko/incubator-airflow,jgao54/airflow,sid88in/incubator-airflow,Acehaidrey/incubator-airflow,mtagle/airflow,bolkedebruin/airflow,malmiron/incubator-airflow,zack3241/incubator-airflow,Fokko/incubator-airflow,jfantom/incubator-airflow,dhuang/incubator-airflow,wooga/airflow,bolkedebruin/airflow,KL-WLCR/incubator-airflow,bolkedebruin/airflow,mtagle/airflow,sergiohgz/incubator-airflow,hgrif/incubator-airflow,apache/airflow,wolfier/incubator-airflow,criccomini/airflow,CloverHealth/airflow,apache/airflow,apache/airflow,artwr/airflow,Fokko/incubator-airflow,sekikn/incubator-airflow,OpringaoDoTurno/airflow,RealImpactAnalytics/airflow,mistercrunch/airflow,gtoonstra/airflow,wooga/airflow,sid88in/incubator-airflow,Tagar/incubator-airflow,akosel/incubator-airflow,spektom/incubator-airflow,skudriashev/incubator-airflow,mrkm4ntr/incubator-airflow,skudriashev/incubator-airflow,cfei18/incubator-airflow,wndhydrnt/airflow,danielvdende/incubator-airflow,wileeam/airflow,skudriashev/incubator-airflow,skudriashev/incubator-airflow,zack3241/incubator-airflow,yk5/incubator-airflow,lxneng/incubator-airflow,nathanielvarona/airflow,fenglu-g/incubator-airflow,jfantom/incubator-airflow,criccomini/airflow,RealImpactAnalytics/airflow,mtagle/airflow,RealImpactAnalytics/airflow,apache/airflow,subodhchhabra/airflow,DinoCow/airflow,akosel/incubator-airflow,akosel/incubator-airflow,CloverHealth/airflow,lxneng/incubator-airflow,yk5/incubator-airflow,owlabs/incubator-airflow,wolfier/incubator-airflow,nathanielvarona/airflow,mtagle/airflow,adamhaney/airflow,lyft/incubator-airflow,airbnb/airflow,edgarRd/incubator-airflow,wileeam/airflow,DinoCow/airflow,jgao54/airflow,adamhaney/airflow,jfantom/incubator-airflow,wooga/airflow,cfei18/incubator-airflow,CloverHealth/airflow,airbnb/airflow,akosel/incubator-airflow,criccomini/airflow,wolfier/incubator-airflow,apache/airflow,hgrif/incubator-airflow,DinoCow/airflow,MortalViews/incubator-airflow,KL-WLCR/incubator-airflow,danielvdende/incubator-airflow,hgrif/incubator-airflow,andyxhadji/incubator-airflow,wndhydrnt/airflow,r39132/airflow,yati-sagade/incubator-airflow,mistercrunch/airflow,CloverHealth/airflow,malmiron/incubator-airflow