Moved Jenkins out of the default build path of Mesos.
Moved Jenkins out of the default build path of Mesos.

Review: https://reviews.apache.org/r/12836

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