[AIRFLOW-809][AIRFLOW-1] Use __eq__ ColumnOperator When Testing Booleans
[AIRFLOW-809][AIRFLOW-1] Use __eq__ ColumnOperator When Testing Booleans

The .is_ ColumnOperator causes the SqlAlchemy's
MSSQL dialect to produce
IS 0 when given a value of False rather than a
value of None. The __eq__
ColumnOperator does this same test with the added
benefit that it will
modify the resulting expression from and == to a
IS NULL when the target
is None.

This change replaces all is_ ColumnOperators that
are doing boolean
comparisons and leaves all is_ ColumnOperators
that are checking for
None values.

Closes #2022 from gritlogic/AIRFLOW-809

jgao54/airflow,apache/airflow,wndhydrnt/airflow,jlowin/airflow,vijaysbhat/incubator-airflow,N3da/incubator-airflow,artwr/airflow,Fokko/incubator-airflow,Tagar/incubator-airflow,Acehaidrey/incubator-airflow,mrkm4ntr/incubator-airflow,hamedhsn/incubator-airflow,fenglu-g/incubator-airflow,dgies/incubator-airflow,subodhchhabra/airflow,andrewmchen/incubator-airflow,mistercrunch/airflow,hamedhsn/incubator-airflow,akosel/incubator-airflow,N3da/incubator-airflow,N3da/incubator-airflow,danielvdende/incubator-airflow,zoyahav/incubator-airflow,Fokko/incubator-airflow,owlabs/incubator-airflow,NielsZeilemaker/incubator-airflow,cfei18/incubator-airflow,jiwang576/incubator-airflow,spektom/incubator-airflow,zack3241/incubator-airflow,Twistbioscience/incubator-airflow,jesusfcr/airflow,sekikn/incubator-airflow,sergiohgz/incubator-airflow,rishibarve/incubator-airflow,adrpar/incubator-airflow,lyft/incubator-airflow,cjqian/incubator-airflow,ProstoMaxim/incubator-airflow,mrkm4ntr/incubator-airflow,andyxhadji/incubator-airflow,cfei18/incubator-airflow,dmitry-r/incubator-airflow,zack3241/incubator-airflow,zoyahav/incubator-airflow,artwr/airflow,andyxhadji/incubator-airflow,yati-sagade/incubator-airflow,lyft/incubator-airflow,easytaxibr/airflow,saguziel/incubator-airflow,malmiron/incubator-airflow,mrares/incubator-airflow,DinoCow/airflow,Acehaidrey/incubator-airflow,aminghadersohi/airflow,AllisonWang/incubator-airflow,gtoonstra/airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,preete-dixit-ck/incubator-airflow,mattuuh7/incubator-airflow,jfantom/incubator-airflow,sekikn/incubator-airflow,apache/airflow,malmiron/incubator-airflow,spektom/incubator-airflow,fenglu-g/incubator-airflow,andyxhadji/incubator-airflow,mistercrunch/airflow,apache/incubator-airflow,mtagle/airflow,dhuang/incubator-airflow,Twistbioscience/incubator-airflow,mtagle/airflow,Fokko/incubator-airflow,andrewmchen/incubator-airflow,skudriashev/incubator-airflow,adrpar/incubator-airflow,MetrodataTeam/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,vijaysbhat/incubator-airflow,jlowin/airflow,wileeam/airflow,edgarRd/incubator-airflow,yk5/incubator-airflow,r39132/airflow,brandsoulmates/incubator-airflow,MetrodataTeam/incubator-airflow,KL-WLCR/incubator-airflow,dmitry-r/incubator-airflow,rishibarve/incubator-airflow,zodiac/incubator-airflow,sekikn/incubator-airflow,dhuang/incubator-airflow,gtoonstra/airflow,ronfung/incubator-airflow,andrewmchen/incubator-airflow,wndhydrnt/airflow,zack3241/incubator-airflow,owlabs/incubator-airflow,aminghadersohi/airflow,yati-sagade/incubator-airflow,akosel/incubator-airflow,stverhae/incubator-airflow,danielvdende/incubator-airflow,MetrodataTeam/incubator-airflow,KL-WLCR/incubator-airflow,stverhae/incubator-airflow,wooga/airflow,alexvanboxel/airflow,OpringaoDoTurno/airflow,jgao54/airflow,jiwang576/incubator-airflow,cjqian/incubator-airflow,Acehaidrey/incubator-airflow,apache/airflow,apache/airflow,yati-sagade/incubator-airflow,zoyahav/incubator-airflow,jgao54/airflow,danielvdende/incubator-airflow,wndhydrnt/airflow,hamedhsn/incubator-airflow,jhsenjaliya/incubator-airflow,Tagar/incubator-airflow,brandsoulmates/incubator-airflow,wolfier/incubator-airflow,nathanielvarona/airflow,mtagle/airflow,stverhae/incubator-airflow,asnir/airflow,airbnb/airflow,edgarRd/incubator-airflow,apache/incubator-airflow,apache/airflow,MortalViews/incubator-airflow,jhsenjaliya/incubator-airflow,saguziel/incubator-airflow,KL-WLCR/incubator-airflow,saguziel/incubator-airflow,mrares/incubator-airflow,jhsenjaliya/incubator-airflow,fenglu-g/incubator-airflow,dmitry-r/incubator-airflow,jgao54/airflow,NielsZeilemaker/incubator-airflow,ronfung/incubator-airflow,ronfung/incubator-airflow,danielvdende/incubator-airflow,OpringaoDoTurno/airflow,N3da/incubator-airflow,zodiac/incubator-airflow,jlowin/airflow,ProstoMaxim/incubator-airflow,janczak10/incubator-airflow,hgrif/incubator-airflow,CloverHealth/airflow,nathanielvarona/airflow,easytaxibr/airflow,jiwang576/incubator-airflow,mrkm4ntr/incubator-airflow,nathanielvarona/airflow,lxneng/incubator-airflow,Tagar/incubator-airflow,jfantom/incubator-airflow,ronfung/incubator-airflow,owlabs/incubator-airflow,gilt/incubator-airflow,janczak10/incubator-airflow,mattuuh7/incubator-airflow,NielsZeilemaker/incubator-airflow,owlabs/incubator-airflow,skudriashev/incubator-airflow,asnir/airflow,holygits/incubator-airflow,dhuang/incubator-airflow,holygits/incubator-airflow,DinoCow/airflow,sekikn/incubator-airflow,alexvanboxel/airflow,sid88in/incubator-airflow,rishibarve/incubator-airflow,brandsoulmates/incubator-airflow,OpringaoDoTurno/airflow,akosel/incubator-airflow,artwr/airflow,adamhaney/airflow,adamhaney/airflow,NielsZeilemaker/incubator-airflow,AllisonWang/incubator-airflow,wileeam/airflow,gilt/incubator-airflow,lyft/incubator-airflow,jfantom/incubator-airflow,sdiazb/airflow,andrewmchen/incubator-airflow,wileeam/airflow,alexvanboxel/airflow,Acehaidrey/incubator-airflow,malmiron/incubator-airflow,DinoCow/airflo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