Update to latest release, drop the chown

The permissions are now [fixed](criteo/cassandra_exporter#68) in upstream repo, so we can drop [the chown](#4 (review)):
```
porridge@beczulka:~$ docker run criteord/cassandra_exporter:2.3.2 ls -l /opt/cassandra_exporter
Unable to find image 'criteord/cassandra_exporter:2.3.2' locally
2.3.2: Pulling from criteord/cassandra_exporter
bc51dd8edc1b: Pull complete
d1d06863bb82: Pull complete
adf4d10a782b: Pull complete
7db4424ff270: Pull complete
e008a301333c: Pull complete
10121b885a52: Pull complete
0d34188e8091: Pull complete
fc3c7604e1c5: Pull complete
019737f36353: Pull complete
a26e5d6f647b: Pull complete
3b6b59aecfbd: Pull complete
Digest: sha256:9fe7cfef9b03ca294c80e5da098add4698c4103bbddf382dd93d2e01a073d6e3
Status: Downloaded newer image for criteord/cassandra_exporter:2.3.2
total 4760
-rw-rw-r-- 1 root root 4871483 Feb 10 13:31 cassandra_exporter.jar
porridge@beczulka:~$
```
We actually bump to 2.3.3 since the earlier one was non-functional.

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to
 
 ### Changed
 
+- Bumped Cassandra Prometheus Exporter to 2.3.3 and no longer chown its JAR.
+  ([#56](https://github.com/mesosphere/kudo-cassandra-operator/pull/56))
+
 ### Added
 
 - TLS encryption for node-to-node and client-to-node connections.

images/Dockerfile.prometheus-exporter

@@ -1,3 +1 @@
-FROM criteord/cassandra_exporter:2.2.1
-
-RUN chown 999:999 /opt/cassandra_exporter/cassandra_exporter.jar
+FROM criteord/cassandra_exporter:2.3.3

metadata.sh

@@ -43,7 +43,7 @@ export KUDO_VERSION="0.10.1"
 export KUBERNETES_VERSION="1.15.0"
 
 export CASSANDRA_EXPORTER_DOCKER_IMAGE="criteord/cassandra_exporter"
-export CASSANDRA_EXPORTER_VERSION="2.2.1"
+export CASSANDRA_EXPORTER_VERSION="2.3.3"
 
 ################################################################################
 ############################## Docker images ###################################

operator/params.yaml

@@ -113,7 +113,7 @@ parameters:
 
   - name: PROMETHEUS_EXPORTER_DOCKER_IMAGE
     description: "Prometheus exporter Docker image."
-    default: "mesosphere/cassandra-prometheus-exporter:2.2.1-0.1.2-SNAPSHOT"
+    default: "mesosphere/cassandra-prometheus-exporter:2.3.3-0.1.2-SNAPSHOT"
 
   - name: PROMETHEUS_EXPORTER_DOCKER_IMAGE_PULL_POLICY
     description: "Prometheus exporter Docker image pull policy."

templates/images/Dockerfile.prometheus-exporter.template

@@ -1,3 +1 @@
 FROM ${PROMETHEUS_EXPORTER_DOCKER_IMAGE_FROM}
-
-RUN chown 999:999 /opt/cassandra_exporter/cassandra_exporter.jar