End 2 End tests speedup (#1180)

* Improving end 2 end tests, especially speed of execution and error, by implementing proper eventual asserts and timeouts.
* Add documentation for running individual tests
* Fixed String encoding in Patorni state check and error case
* Printing config as multi log line entity, makes it readable and grepable on startup
* Cosmetic changes to logs. Removed quotes from diff. Move all object diffs to text diff. Enabled padding for log level.
* Mount script with tools for easy logaccess and watching objects.
* Set proper update strategy for Postgres operator deployment.
* Move long running test to end. Move pooler test to new functions.
* Remove quote from valid K8s identifiers.

e2e/scripts/cleanup.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+kubectl delete postgresql acid-minimal-cluster
+kubectl delete deployments -l application=db-connection-pooler,cluster-name=acid-minimal-cluster
+kubectl delete statefulsets -l application=spilo,cluster-name=acid-minimal-cluster
+kubectl delete services -l application=spilo,cluster-name=acid-minimal-cluster
+kubectl delete configmap postgres-operator
+kubectl delete deployment postgres-operator

e2e/scripts/get_logs.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+kubectl logs $(kubectl get pods -l name=postgres-operator --field-selector status.phase=Running -o jsonpath='{.items..metadata.name}')

e2e/scripts/watch_objects.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+watch -c "
+kubectl get postgresql
+echo
+echo -n 'Rolling upgrade pending: '
+kubectl get statefulset -o jsonpath='{.items..metadata.annotations.zalando-postgres-operator-rolling-update-required}'
+echo
+echo
+kubectl get pods -o wide
+echo
+kubectl get statefulsets
+echo
+kubectl get deployments
+echo
+kubectl get pods -l name=postgres-operator -o jsonpath='{.items..metadata.annotations.step}'
+echo
+kubectl get pods -l application=spilo -o jsonpath='{.items..spec.containers..image}'
+"