Removed trailing '/' in Makefile.am.
Removed trailing '/' in Makefile.am.

Review: https://reviews.apache.org/r/23829

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