[AIRFLOW-523] Add AltX as Airflow user
[AIRFLOW-523] Add AltX as Airflow user

Dear Airflow Maintainers,

Please accept this PR that addresses the following
issues:
- [AIRFLOW-523](https://issues.apache.org/jira/bro
wse/AIRFLOW-523)

Testing Done:
- Tests passing in Travis CI

Closes #1807 from PedroMDuarte/add-altx-airflow-
user

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