SRVCOM-440: Install.sh sometimes timeouts on OCP4/AWS waiting for istio-operator

Refers to:
[SRVCOM-440](https://jira.coreos.com/browse/SRVCOM-4400

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* with timeout in https://github.com/openshift-cloud-functions/knative-operators/blob/openshift-v0.4.0/etc/scripts/installation-functions.sh#L236

* It seems that sometimes it takes suspiciously long for the istio-operator pod to be created.

* The Istio operator version is maistra/istio-operator-centos7:0.5.0 from https://github.com/openshift-cloud-functions/knative-operators/blob/release-v0.4.0/maistra-operators.catalogsource.yaml#L110

* Istio version 1: https://docs.openshift.com/container-platform/3.11/servicemesh-release-notes/servicemesh-release-notes.html#new-features-technology-preview-6 The latest is 0.10, but that is based on Istio 1.1.

Author: nebelsprachen

knative-OCP-4x.md

@@ -39,7 +39,7 @@
 
    `./etc/scripts/install.sh`  
 
->**NOTE** The installation script takes around 20-30 minutes to complete, depending on your system.
+>**NOTE:** The `install.sh` script can time-out waiting for an Istio operator and you may recieve a `ERROR: Timed out` message. If the `install.sh` script fails to install Istio, run the script again after it times out.
 
 4. Once the script starts, you will see the following warning and prompt.