Reused previous task status for health updates in command executor.
Reused previous task status for health updates in command executor.

When a new health task status update is generated in the executor, we
have to make sure specific data is duplicated from the previous one to
avoid shadowing of those data during reconciliation.

Review: https://reviews.apache.org/r/56210

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