Update synth.py to add AUTHENTICATION.md to file lists in *.gemspec and .yardopts

[quartzmo]

Add AUTHENTICATION.md to file lists in *.gemspec and .yardopts

For background, see: googleapis/synthtool#225

[refs #2933]

Example result:

Chriss-iMac:google-cloud-asset quartzmo$ git diff
diff --git a/google-cloud-asset/.yardopts b/google-cloud-asset/.yardopts
index a221a1518..06724a8d2 100644
--- a/google-cloud-asset/.yardopts
+++ b/google-cloud-asset/.yardopts
@@ -7,3 +7,4 @@
 ./lib/**/*.rb
 -
 README.md
+AUTHENTICATION.md
diff --git a/google-cloud-asset/google-cloud-asset.gemspec b/google-cloud-asset/google-cloud-asset.gemspec
index 679d9ef0e..db09ab793 100644
--- a/google-cloud-asset/google-cloud-asset.gemspec
+++ b/google-cloud-asset/google-cloud-asset.gemspec
@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
   gem.platform      = Gem::Platform::RUBY
 
   gem.files         = `git ls-files -- lib/*`.split("\n") +
-                      ["README.md", "LICENSE", ".yardopts"]
+                      ["README.md", "AUTHENTICATION.md", "LICENSE", ".yardopts"]
   gem.require_paths = ["lib"]
 
   gem.required_ruby_version = ">= 2.0.0"

[quartzmo]

If this looks good for google-cloud-asset, I will copy the change to the other generated packages. This change will not be copied to the manual/veneer packages.

[blowmage]

Should this change be made to #3171 instead?

[quartzmo]

I was thinking it will be easier to understand and track our changes to synth.py if we keep them separate from generated PRs.

[dazuma]

Generally, these synth hacks are to be present until we fix it upstream, so I've generally been writing them so that when it does get fixed upstream, it doesn't break. For example, instead of replacing "README.md" with "README.md", "AUTHENTICATION.md", I'd replace "README.md", "LICENSE" with "README.md", "AUTHENTICATION.md", "LICENSE"

[quartzmo]

Updated.

[dazuma]

Similarly here, I'd suggest replacing README.md\n with README.md\nAUTHENTICATION.md\n

[quartzmo]

Updated. I also found 2 gems in which LICENSE was being added to .yardopts, and in these files I merged the older operation with this one.

[quartzmo]

@dazuma Look OK to merge now?