don't generate discovery when discoverable is false

[tangiel]

No description provided.

[codecov-io]

Codecov Report

Merging #143 into master will increase coverage by 0.37%.
The diff coverage is 72.72%.

@@             Coverage Diff              @@
##             master     #143      +/-   ##
============================================
+ Coverage     80.02%   80.39%   +0.37%     
- Complexity     1677     1707      +30     
============================================
  Files           156      156              
  Lines          5591     5779     +188     
  Branches        729      803      +74     
============================================
+ Hits           4474     4646     +172     
- Misses          840      852      +12     
- Partials        277      281       +4

Impacted Files	Coverage Δ	Complexity Δ
...i/server/spi/discovery/LocalDiscoveryProvider.java	85.29% <ø> (ø)	10 <0> (ø)	⬇️
...e/api/server/spi/discovery/DiscoveryGenerator.java	91.07% <72.72%> (+2.44%)	74 <0> (+13)	⬆️
...ava/com/google/api/server/spi/auth/GoogleAuth.java	84.61% <0%> (-1.1%)	48% <0%> (+15%)
...api/server/spi/auth/GoogleOAuth2Authenticator.java	86.66% <0%> (-0.44%)	11% <0%> (+1%)
...le/api/server/spi/auth/EndpointsAuthenticator.java	100% <0%> (ø)	6% <0%> (ø)	⬇️
.../server/spi/auth/GoogleAppEngineAuthenticator.java	86.07% <0%> (+0.62%)	17% <0%> (+1%)	⬆️

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