analytics option to switch nodeExporter port

[ryandawsonuk]

fixes #1916

First time I ran the upgrade I hit the immutable field problem helm/helm#7173

Then I had to do:

kubectl delete deployment -n seldon-system -l app=grafana

If I'd done that once before upgrading that probably would've been enough. But because of the failed attempt I also had to do:

kubectl delete -n seldon-system sa seldon-core-analytics-kube-state-metrics
kubectl delete clusterrole seldon-core-analytics-kube-state-metrics
kubectl delete clusterrolebinding seldon-core-analytics-kube-state-metrics
kubectl delete -n seldon-system svc seldon-core-analytics-kube-state-metrics
kubectl delete deployment -n seldon-system seldon-core-analytics-kube-state-metrics

Then I was able to run

helm upgrade --install seldon-core-analytics ./helm-charts/seldon-core-analytics/ --namespace seldon-system --set prometheus.nodeExporter.service.hostPort=9200 --set prometheus.nodeExporter.service.servicePort=9200

Have included a note on upgrading in the upgrading.md

[seldondev]

Fri Jun 5 10:26:48 UTC 2020
The logs for [pr-build] [1] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/1.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=1

[seldondev]

Fri Jun 5 10:27:54 UTC 2020
The logs for [lint] [2] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/2.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=2

[seldondev]

Fri Jun 5 10:28:59 UTC 2020
The logs for [lint] [4] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/4.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=4

[seldondev]

Fri Jun 5 10:29:15 UTC 2020
The logs for [pr-build] [3] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/3.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=3

[ryandawsonuk]

/test this

[seldondev]

Fri Jun 5 10:43:32 UTC 2020
The logs for [pr-build] [5] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/5.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=5

[axsaucedo]

Looks good
/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: axsaucedo

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [axsaucedo]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[seldondev]

Fri Jun 12 15:06:33 UTC 2020
The logs for [pr-build] [6] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/6.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=6

[seldondev]

Fri Jun 12 15:06:37 UTC 2020
The logs for [lint] [7] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/7.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=7

[axsaucedo]

Not sure how this could break PR build 🤔
/test this

[seldondev]

Fri Jun 12 15:14:44 UTC 2020
The logs for [pr-build] [8] will show after the pipeline context has finished.
https://github.com/SeldonIO/seldon-core/blob/gh-pages/jenkins-x/logs/SeldonIO/seldon-core/PR-1917/8.log

impatient try
jx get build logs SeldonIO/seldon-core/PR-1917 --build=8