Unify properties and mark duplicates as deprecated

Some properties are duplicated, for instance: nuxeo.http.proxy.ntlm.host and org.nuxeo.connect.proxy.ntlm.host
Both are used in nuxeo-connect-client:

    public static String getProxyNTLMHost() {
        return NuxeoConnectClient.getProperty(CONNECT_PROXY_NTLM_HOST,
                NuxeoConnectClient.getProperty(NUXEO_PROXY_NTLM_HOST, null));
    }

But Nuxeo platform mostly uses nuxeo.*, not org.nuxeo.connect.*.

Update the doc and mark the org.nuxeo.connect.* as deprecated.