Added a missing test target in Makefile.am.
Added a missing test target in Makefile.am.

Review: https://reviews.apache.org/r/24583

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