TASK_ERROR is terminal
TASK_ERROR is terminal

TASK_ERROR was introduced as a new terminal state, but was not handled
as such in mesos::internal::protobuf::isTerminalState.

Review: https://reviews.apache.org/r/29610

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