Added upgrade testing script.
Added upgrade testing script.

Review: https://reviews.apache.org/r/44229/

zmalik/mesos,verizonlabs/mesos,Gilbert88/mesos,abudnik/mesos,jpeach/mesos,reneploetz/mesos,asamerh4/mesos,Aman-Jain-14/customizedMesos,Gilbert88/mesos,dforsyth/mesos,dforsyth/mesos,kaysoky/mesos,gsantovena/mesos,craimbert/mesos,neilconway/mesos,Gilbert88/mesos,reneploetz/mesos,dforsyth/mesos,verizonlabs/mesos,yuquanshan/customizedMesos,chhsia0/mesos,kaysoky/mesos,chhsia0/mesos,abudnik/mesos,yuquanshan/customizedMesos,neilconway/mesos,reneploetz/mesos,gsantovena/mesos,Aman-Jain-14/customizedMesos,andschwa/mesos,reneploetz/mesos,reneploetz/mesos,gsantovena/mesos,yuquanshan/customizedMesos,andschwa/mesos,jpeach/mesos,andschwa/mesos,zmalik/mesos,Gilbert88/mesos,Aman-Jain-14/customizedMesos,abudnik/mesos,yuquanshan/customizedMesos,andschwa/mesos,gsantovena/mesos,kaysoky/mesos,Aman-Jain-14/customizedMesos,kaysoky/mesos,neilconway/mesos,verizonlabs/mesos,abudnik/mesos,chhsia0/mesos,craimbert/mesos,jpeach/mesos,Aman-Jain-14/customizedMesos,Aman-Jain-14/customizedMesos,craimbert/mesos,zmalik/mesos,yuquanshan/customizedMesos,craimbert/mesos,asamerh4/mesos,chhsia0/mesos,yuquanshan/customizedMesos,andschwa/mesos,zmalik/mesos,asamerh4/mesos,chhsia0/mesos,andschwa/mesos,gsantovena/mesos,chhsia0/mesos,zmalik/mesos,craimbert/mesos,verizonlabs/mesos,verizonlabs/mesos,jpeach/mesos,neilconway/mesos,neilconway/mesos,kaysoky/mesos,dforsyth/mesos,Gilbert88/mesos,andschwa/mesos,dforsyth/mesos,zmalik/mesos,kaysoky/mesos,verizonlabs/mesos,craimbert/mesos,Gilbert88/mesos,yuquanshan/customizedMesos,asamerh4/mesos,asamerh4/mesos,jpeach/mesos,kaysoky/mesos,reneploetz/mesos,Gilbert88/mesos,neilconway/mesos,asamerh4/mesos,neilconway/mesos,dforsyth/mesos,asamerh4/mesos,abudnik/mesos,gsantovena/mesos,jpeach/mesos,verizonlabs/mesos,dforsyth/mesos,Aman-Jain-14/customizedMesos,jpeach/mesos,zmalik/mesos,chhsia0/mesos,abudnik/mesos,reneploetz/mesos,craimbert/mesos,abudnik/mesos,gsantovena/mesos