Add a run_with_retries nc call to sql proxy after starting it. (#356)
Add a run_with_retries nc call to sql proxy after starting it. (#356)

The systemctl start may return asynchronously while cloud-sql-proxy
is not yet ready, such that subsequent attempts to initialize the
metastore will fail.
GoogleCloudDataproc/initialization-actions,GoogleCloudDataproc/initialization-actions,dennishuo/dataproc-initialization-actions,GoogleCloudDataproc/initialization-actions,dennishuo/dataproc-initialization-actions