Generate all preferred APIs by default (#613)

This commit removes support for the `id` flag from the `generate-api`
script. Additional Discovery documents are still supported via the `url`
flag.

The new behavior is to generate clients for all APIs marked as preferred
by the Discovery index if the `from_discovery` flag is `true`.

script/generate

@@ -4,134 +4,6 @@
 
 DIR=$(dirname $( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd ))
 
-API_IDS=(acceleratedmobilepageurl:v1 \
-  adexchangebuyer:v1.4 \
-  adexchangebuyer2:v2beta1 \
-  adexchangeseller:v2.0 \
-  admin:directory_v1 \
-  admin:datatransfer_v1 \
-  admin:reports_v1 \
-  adsense:v1.4 \
-  adsensehost:v4.1 \
-  analytics:v3 \
-  analyticsreporting:v4 \
-  androidenterprise:v1 \
-  androidpublisher:v2 \
-  appengine:v1 \
-  appsactivity:v1 \
-  appsmarket:v2 \
-  appstate:v1 \
-  autoscaler:v1beta2 \
-  bigquery:v2 \
-  blogger:v3 \
-  books:v1 \
-  calendar:v3 \
-  civicinfo:v2 \
-  classroom:v1 \
-  cloudbilling:v1 \
-  cloudbuild:v1 \
-  clouddebugger:v2 \
-  clouderrorreporting:v1beta1 \
-  cloudfunctions:v1 \
-  cloudkms:v1 \
-  cloudkms:v1beta1 \
-  cloudlatencytest:v2 \
-  cloudmonitoring:v2beta2 \
-  cloudresourcemanager:v1beta1 \
-  cloudresourcemanager:v1 \
-  cloudtrace:v1 \
-  clouduseraccounts:beta \
-  compute:v1 \
-  compute:beta \
-  container:v1 \
-  content:v2 \
-  coordinate:v1 \
-  customsearch:v1 \
-  dataflow:v1b3 \
-  dataproc:v1 \
-  datastore:v1 \
-  deploymentmanager:v2 \
-  dfareporting:v2.6 \
-  dfareporting:v2.7 \
-  dfareporting:v2.8 \
-  discovery:v1 \
-  dns:v1 \
-  dns:v2beta1 \
-  doubleclickbidmanager:v1 \
-  doubleclicksearch:v2 \
-  drive:v2 \
-  drive:v3 \
-  firebasedynamiclinks:v1 \
-  firebaserules:v1 \
-  fitness:v1 \
-  fusiontables:v2 \
-  games:v1 \
-  gamesConfiguration:v1configuration \
-  gamesManagement:v1management \
-  gan:v1beta1 \
-  genomics:v1 \
-  gmail:v1 \
-  groupsmigration:v1 \
-  groupssettings:v1 \
-  iam:v1 \
-  identitytoolkit:v3 \
-  kgsearch:v1 \
-  language:v1beta1 \
-  language:v1 \
-  licensing:v1 \
-  logging:v2beta1 \
-  logging:v2 \
-  manager:v1beta2 \
-  manufacturers:v1 \
-  mapsengine:v1 \
-  mirror:v1 \
-  ml:v1 \
-  oauth2:v2 \
-  pagespeedonline:v2 \
-  partners:v2 \
-  people:v1 \
-  plus:v1 \
-  plusDomains:v1 \
-  prediction:v1.6 \
-  proximitybeacon:v1beta1 \
-  pubsub:v1 \
-  qpxExpress:v1 \
-  replicapool:v1beta2 \
-  replicapoolupdater:v1beta1 \
-  reseller:v1 \
-  resourceviews:v1beta2 \
-  runtimeconfig:v1 \
-  script:v1 \
-  searchconsole:v1 \
-  servicecontrol:v1 \
-  servicemanagement:v1 \
-  serviceuser:v1 \
-  sheets:v4 \
-  siteVerification:v1 \
-  slides:v1 \
-  sourcerepo:v1 \
-  spanner:v1 \
-  speech:v1beta1 \
-  sqladmin:v1beta4 \
-  storage:v1 \
-  storagetransfer:v1 \
-  surveys:v2 \
-  tagmanager:v1 \
-  tagmanager:v2 \
-  taskqueue:v1beta2 \
-  tasks:v1 \
-  toolresults:v1beta3 \
-  tracing:v1 \
-  translate:v2 \
-  urlshortener:v1 \
-  vision:v1 \
-  webfonts:v1 \
-  webmasters:v3 \
-  youtube:v3 \
-  youtubeAnalytics:v1 \
-  youtubereporting:v1 \
-)
-
 URLS=(https://content.googleapis.com/discovery/v1/apis/appsmarket/v2/rest \
       https://content.googleapis.com/discovery/v1/apis/youtubePartner/v1/rest \
       https://content.googleapis.com/discovery/v1/apis/compute/beta/rest \
@@ -139,4 +11,4 @@ URLS=(https://content.googleapis.com/discovery/v1/apis/appsmarket/v2/rest \
       https://monitoring.googleapis.com/\$discovery/rest?version=v3 \
 )
 
-echo 'a' | bundle exec bin/generate-api gen generated --from_discovery=true --names_out=$DIR/api_names_out.yaml --url=${URLS[*]}  --id=${API_IDS[*]}
+echo 'a' | bundle exec bin/generate-api gen generated --from_discovery=true --names_out=$DIR/api_names_out.yaml --url=${URLS[*]}