rewrite_tag plugin hostname command fix to work with OL8 Image on OCR

Author: santhoshkvuda

logan/kubernetes-resources/logs-collection/configmap-cri.yaml

@@ -479,6 +479,7 @@ data:
     # Match block to filter kubelet logs from syslogs
     <match oci.oke.syslog.messages.**>
        @type rewrite_tag_filter
+       hostname_command cat /etc/hostname
        <rule>
        key message
        pattern /kubelet:/

logan/kubernetes-resources/logs-collection/configmap-docker.yaml

@@ -402,6 +402,7 @@ data:
     # Match block to filter kubelet logs from syslogs
     <match oci.oke.syslog.messages.**>
        @type rewrite_tag_filter
+       hostname_command cat /etc/hostname
        <rule>
        key message
        pattern /kubelet:/