Update to latest release, drop the chown

[porridge]

The permissions are now fixed in upstream repo, so we can drop the chown:

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:~$ 

[porridge]

friendly ping @nfnt and @ANeumann82

[ANeumann82]

I'm not sure why we chown'd in the first place, but I assume it now works without it. We do have an IT for this, so if it's green i'm fine :)

[porridge]

I'm not sure why we chown'd in the first place, but I assume it now works without it.

@ANeumann82 the reason is explained in the comments linked from this PR's description.

We do have an IT for this, so if it's green i'm fine :)

Yeah, although it's not that robust unfortunately.

[porridge]

A-ha!

[main] INFO com.criteo.nosql.cassandra.exporter.Config - Loading yaml config from /etc/cassandra_exporter/config.yml
[main] ERROR com.criteo.nosql.cassandra.exporter.Config - Cannot load config file
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "maxScrapFrequencyInSec" (class com.criteo.nosql.cassandra.exporter.Config), not marked as ignorable (9 known properties: "host", "additionalLabelsFromEnvvars", "user", "ssl", "blacklist", "listenPort", "password", "listenAddress", "maxScrapeFrequencyInSec"])
 at [Source: (File); line: 50, column: 3] (through reference chain: com.criteo.nosql.cassandra.exporter.Config["maxScrapFrequencyInSec"])

💥

[porridge]

OK, this was an adventure but it looks like I got it working in the end.
PTAL @ANeumann82 since there are some new changes.

[porridge]

Turns out they made yet another release after me reporting the issue, so now I backed out these new changes. Merging.