[EXPERIMENTAL] Support for BigQuery backend as cAdvisor storage driver.
The current implementation takes bunch of BigQuery specific flags for authentication.
These will be merged into a single backend config.
To run the current version, following flags need to be specified:
# Storage driver to use.
-storage_driver=bigquery
# Information about server-to-server Oauth token.
# These can be obtained by creating a Service Account client id under `Google Developer API`
# service client id
-bq_id="XYZ.apps.googleusercontent.com"
# service email address
-bq_account="ABC@developer.gserviceaccount.com"
# path to pem key (converted from p12 file)
-bq_credentials_file="/path/to/key.pem"
# project id to use for storing datasets.
-bq_project_id="awesome_project"