* Mount the host filesystem inside the container

- Remove the /rootfs/proc and /rootfs/sys mounts
- Mount the host filesystem on /hostfs

* Set HOST_PROC, HOST_SYS and HOST_MOUNT_PREFIX vars

- Set HOST_PROC and HOST_SYS to the new location
- Set HOST_MOUNT_PREFIX so that /hostfs is stripped from the reported path

* Bump telegraf-ds chart version to 1.0.23

* Fix lint issues