Che Operator snips proxy URL incorrectly

While installing CRW on Customer site, we found that Operator snips out first letter of the proxy URL. Proxy URL was configured as per https://access.redhat.com/documentation/en-us/red_hat_codeready_workspaces/2.1/html-single/installation_guide/index#preparing-codeready-workspaces-custom-resource-for-installing-behind-a-proxy 

in CheCluster CR

proxyURL: 'http://proxy.customer.com'

proxyPort: '8080'

When we try to create workspace, it fails to connect to internet. We noticed that httpproxy URL in JAVA_OPTS was referred to as "roxy.customer.com". "p" got snipped out.

This code is being written from https://github.com/eclipse/che-operator/blob/crw-2.1/pkg/util/util.go#L238.

It uses strings.TrimLeft which is why "p" is getting removed. Here is the documentation.

https://golang.org/pkg/strings/#TrimLeft. 

"TrimPrefix" must be used instead.