Made v1 API in mesos.proto equivalent to non-v1 for 0.26.0.
Made v1 API in mesos.proto equivalent to non-v1 for 0.26.0.

Copied missing feature updates to v1 from include/mesos/mesos.proto.

This is a revised version of RR 41046 by Bernd Matthiske.

Review: https://reviews.apache.org/r/41060

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