Merge pull request #60722 from filbranden/fluentd1

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove mapping to /host/lib from fluentd-gcp container.

**What this PR does / why we need it**:

This mapping is no longer needed since fluentd-gcp v2.0.16, in which it started using a container image based on Debian Stretch, in which the systemd libraries already include support for all the supported
compression algorithms.

The `/run.sh` in the image no longer accesses `/host/lib` anyways, so let's stop mapping it here.

Related changes:
- fluentd-gcp on GoogleCloudPlatform/k8s-stackdriver#101
- fluentd-es on GoogleCloudPlatform/google-fluentd#80

/assign @timstclair 
/cc @crassirostris @bmoyles0117 

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
N/A

**Special notes for your reviewer**:
N/A

**Release note**:

```release-note
NONE
```

cluster/addons/fluentd-elasticsearch/fluentd-es-ds.yaml

@@ -92,9 +92,6 @@ spec:
         - name: varlibdockercontainers
           mountPath: /var/lib/docker/containers
           readOnly: true
-        - name: libsystemddir
-          mountPath: /host/lib
-          readOnly: true
         - name: config-volume
           mountPath: /etc/fluent/config.d
       nodeSelector:
@@ -107,10 +104,6 @@ spec:
       - name: varlibdockercontainers
         hostPath:
           path: /var/lib/docker/containers
-      # It is needed to copy systemd library to decompress journals
-      - name: libsystemddir
-        hostPath:
-          path: /usr/lib64
       - name: config-volume
         configMap:
           name: fluentd-es-config-v0.1.4

cluster/addons/fluentd-gcp/fluentd-gcp-ds.yaml

@@ -35,9 +35,6 @@ spec:
         - name: varlibdockercontainers
           mountPath: /var/lib/docker/containers
           readOnly: true
-        - name: libsystemddir
-          mountPath: /host/lib
-          readOnly: true
         - name: config-volume
           mountPath: /etc/google-fluentd/config.d
         # Liveness probe is aimed to help in situarions where fluentd
@@ -109,9 +106,6 @@ spec:
       - name: varlibdockercontainers
         hostPath:
           path: /var/lib/docker/containers
-      - name: libsystemddir
-        hostPath:
-          path: /usr/lib64
       - name: config-volume
         configMap:
           name: fluentd-gcp-config-v1.2.4