Add support for fluentd image to run as non-root

[HarelYoav]

Description:

Currently, in the fluentd image, the fluentd client is running as root and writing to the container image filesystem. When using a secure Kubernetes it is not possible to not run as root and not expect to write into the container image root filesystem.

Link to the fluentd image

Expected solution:

Add support to run the flunetd client as non-root and not writing to the container image root filesystem for cases when using a secure K8s cluster.