[18.09] Backport of Increase grpc max recv message size

[anshulpundir]

Backports #2775

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "1809" git@github.com:anshulpundir/swarmkit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842362794960
editor opens
change each 'pick' to 'edit'
save the file and quit
$ git commit --amend -s --no-edit
$ git rebase --continue # and repeat the amend for each commit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[andrewhsu]

LGTM

[andrewhsu]

oh, hmm...circleci failed

[codecov]

Codecov Report

Merging #2776 into bump_v18.09 will decrease coverage by 0.1%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           bump_v18.09    #2776      +/-   ##
===============================================
- Coverage        61.83%   61.72%   -0.11%     
===============================================
  Files              134      134              
  Lines            21859    21862       +3     
===============================================
- Hits             13517    13495      -22     
- Misses            6880     6901      +21     
- Partials          1462     1466       +4