initial BasicAuthExhibitorRestClient

[sclasen]

that can also skip ssl cert validation if required

Also might be nice to provide a convenience method in ExhibitorEnsembleProvider, something like

pubic static ExhibitorEnsembleProvider fromURL(URL vip, boolean validateSsl)

which would create the Exhibitors from the hostname, extract the userInfo, port and path from the url

[sclasen]

This is for CURATOR-112

[tisonkun]

Closed as stale. There're many changes since this patch was made in the first place. Feel free to resubmit it if it's still relevant.