Merge pull request #1486 from chrischdi/pr-cloud-init-stream-to-stdout

cloud-init: improve logging to stream logs to the cloud-init-output.log file instead of dumping at the end

Author: k8s-ci-robot

images/capi/ansible/roles/providers/files/etc/cloud/cloud.cfg.d/05_logging.cfg

@@ -64,4 +64,4 @@ log_cfgs:
 # this tells cloud-init to redirect its stdout and stderr to
 # 'tee -a /var/log/cloud-init-output.log' so the user can see output
 # there without needing to look on the console.
-output: {all: '| python3 -c ''import sys,time;sys.stdout.write("".join(( " ".join((time.strftime("[%Y-%m-%d %H:%M:%S]", time.localtime()), line)) for line in sys.stdin )))'' | tee -a /var/log/cloud-init-output.log'}
+output: {all: '| python3 -c ''exec("import sys,time\nfor line in sys.stdin:\n  sys.stdout.write(\" \".join((time.strftime(\"[%Y-%m-%d %H:%M:%S]\", time.localtime()), line)))")'' | tee -a /var/log/cloud-init-output.log'}