Add PowerPC LE CI for support/docker_build.sh.
Add PowerPC LE CI for support/docker_build.sh.

Review: https://reviews.apache.org/r/45803/

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