chore: release google-cloud-storage 1.31.1 (googleapis#11399)

#### Documentation

* Update IAMCredentialsService#sign_service_account_blob examples

chore: release google-cloud-dialogflow 1.3.0 (googleapis#11401)

chore: release google-cloud-build-v1 0.7.0 (googleapis#11397)

chore: release google-cloud-bigtable-admin-v2 0.5.1 (googleapis#11396)

chore: release stackdriver 0.21.1 (googleapis#11385)

chore: release google-cloud-security_center-v1 0.7.0 (googleapis#11395)

chore: release google-cloud-security_center-v1p1beta1 0.7.0 (googleap…

…is#11394)

Release google-cloud-compute-v1 0.1.0 (googleapis#11382)

* Release google-cloud-compute-v1 0.1.0

* Initial alpha release

* Update CHANGELOG.md

chore: release google-cloud-speech-v1p1beta1 0.9.0 (googleapis#11238)

chore: release google-cloud-media_translation-v1beta1 0.4.0 (googleap…

…is#11252)