Regenerate protobuf for 3.5

[thaJeztah]

Protobuf was updated to version 3.5, in commit
9b981e2 (#2448), but files were not regenerated.

These are the changes after running make generate after installing protobuf 3.5

Relates to #2444

ping @dperny @stevvooe @anshulpundir

[thaJeztah]

Also wondering if we can have a check in CI catching this

[thaJeztah]

CI is failing on flaky test; #2445

2017-11-17 13:12:02.650232 I | http: TLS handshake error from 127.0.0.1:53797: remote error: tls: bad certificate
2017-11-17 13:12:02.692636 I | http: TLS handshake error from 127.0.0.1:48260: remote error: tls: bad certificate
2017-11-17 13:12:02.747638 I | http: TLS handshake error from 127.0.0.1:48261: remote error: tls: bad certificate
--- FAIL: TestUpdateNodeDemote (10.94s)
	Error Trace:	node_test.go:592
			node_test.go:732
	Error:		Received unexpected error expected node 3 to be unreachable
			polling failed
			github.com/docker/swarmkit/testutils.PollFuncWithTimeout
				/home/ubuntu/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:28
			github.com/docker/swarmkit/testutils.PollFunc
				/home/ubuntu/.go_workspace/src/github.com/docker/swarmkit/testutils/poll.go:36
			github.com/docker/swarmkit/manager/controlapi.testUpdateNodeDemote
				/home/ubuntu/.go_workspace/src/github.com/docker/swarmkit/manager/controlapi/node_test.go:592
			github.com/docker/swarmkit/manager/controlapi.TestUpdateNodeDemote
				/home/ubuntu/.go_workspace/src/github.com/docker/swarmkit/manager/controlapi/node_test.go:732
			testing.tRunner
				/usr/local/go/src/testing/testing.go:657
			runtime.goexit
				/usr/local/go/src/runtime/asm_amd64.s:2197
		

	Error Trace:	node_test.go:605
			node_test.go:732
	Error:		An error is expected but got nil.
		

	Error Trace:	node_test.go:606
			node_test.go:732
	Error:		Not equal: 0x9 (expected)
			        != 0x0 (actual)
		

FAIL

[codecov]

Codecov Report

Merging #2451 into master will decrease coverage by 5.87%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2451      +/-   ##
==========================================
- Coverage   66.51%   60.63%   -5.88%     
==========================================
  Files          93      128      +35     
  Lines       17913    26412    +8499     
==========================================
+ Hits        11914    16016    +4102     
- Misses       5026     8986    +3960     
- Partials      973     1410     +437

[nishanttotla]

I'm curious how this relates to #2447. cc @anshulpundir

[thaJeztah]

#2447 re-generated with the previous version, so this is the same, but with the new (3.5) version #2448