backport of pragma deprecated from network overhaul branch
backport of pragma deprecated from network overhaul branch

Summary: Allow Marathon devs to annotate API fields/types as deprecated.

Test Plan: sbt ramlGenerate

Reviewers: aquamatthias, jeschkies

Reviewed By: aquamatthias, jeschkies

Subscribers: jenkins, marathon-team

Differential Revision: https://phabricator.mesosphere.com/D290

Caerostris/marathon,Caerostris/marathon,guenter/marathon,gsantovena/marathon,guenter/marathon,mesosphere/marathon,natemurthy/marathon,guenter/marathon,mesosphere/marathon,gsantovena/marathon,Caerostris/marathon,gsantovena/marathon,janisz/marathon,janisz/marathon,natemurthy/marathon,janisz/marathon,Caerostris/marathon,janisz/marathon,mesosphere/marathon,meln1k/marathon,gsantovena/marathon,meln1k/marathon,gsantovena/marathon,mesosphere/marathon,Caerostris/marathon,guenter/marathon,janisz/marathon,natemurthy/marathon,meln1k/marathon,meln1k/marathon,meln1k/marathon,mesosphere/marathon,guenter/marathon