Check in synth script and update google-gax

[jkwlui]

Fixes #48
ref: googleapis/google-cloud-node#2837

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[crwilcox]

Seems the generated test is adding an unused helper. If you add that to synth.py to strip this should pass CI.

[jkwlui]

@crwilcox any idea how I might strip a block of code?

[crwilcox]

@kinwa91 I would do something like the below to find the function and replace it with the empty string.

s.replace('file.js',  'function mockSimpleGrpcMethod.*\n(.*\n)*?}', '')

[JustinBeckwith]

If the generator is creating invalid code, that's a P0. Please file a P0 here:
https://github.com/googleapis/gapic-generator

Make sure to add the yoshi and priority: P0 labels.

[codecov]

Codecov Report

Merging #51 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #51   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines           7      7           
=====================================
  Hits            7      7

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[jkwlui]

@crwilcox You are the regex master! It works great, Thanks!