Introduce script for generating test coverage report.
Introduce script for generating test coverage report.

Review: https://reviews.apache.org/r/23828

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