Remove fixed docker daemon log time format in fluentd configs

cluster/addons/fluentd-elasticsearch/fluentd-es-image/td-agent.conf

@@ -144,7 +144,6 @@
 <source>
   type tail
   format /^time="(?<time>[^)]*)" level=(?<severity>[^ ]*) msg="(?<message>[^"]*)"( err="(?<error>[^"]*)")?( statusCode=($<status_code>\d+))?/
-  time_format %Y-%m-%dT%H:%M:%S.%NZ
   path /var/log/docker.log
   pos_file /var/log/es-docker.log.pos
   tag docker

cluster/addons/fluentd-gcp/fluentd-gcp-image/google-fluentd-journal.conf

@@ -93,7 +93,6 @@
 <source>
   type tail
   format /^time="(?<time>[^)]*)" level=(?<severity>[^ ]*) msg="(?<message>[^"]*)"( err="(?<error>[^"]*)")?( statusCode=($<status_code>\d+))?/
-  time_format %Y-%m-%dT%H:%M:%S.%NZ
   path /var/log/docker.log
   pos_file /var/log/gcp-docker.log.pos
   tag docker

cluster/addons/fluentd-gcp/fluentd-gcp-image/google-fluentd.conf

@@ -94,7 +94,6 @@
 <source>
   type tail
   format /^time="(?<time>[^)]*)" level=(?<severity>[^ ]*) msg="(?<message>[^"]*)"( err="(?<error>[^"]*)")?( statusCode=($<status_code>\d+))?/
-  time_format %Y-%m-%dT%H:%M:%S.%NZ
   path /var/log/docker.log
   pos_file /var/log/gcp-docker.log.pos
   tag docker