Fixed slave to properly recover latest run of completed executors.
Fixed slave to properly recover latest run of completed executors.

Review: https://reviews.apache.org/r/14910

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