openshift-java-client: Remove useragent hack that allows jenkins plugin to use "OpenShift" in the useragent

	...
	private static final String USERAGENT_FOR_KEYAUTH = "OpenShift";
	...
	private String setupUserAgent(String authKey, String authIV, String userAgent) {
		if (!StringUtils.isEmpty(authKey)) {
			if (userAgent == null) {
				userAgent = USERAGENT_FOR_KEYAUTH;
			} else if (!userAgent.startsWith(USERAGENT_FOR_KEYAUTH)) {
				userAgent = USERAGENT_FOR_KEYAUTH + '-' + userAgent;
			}
		}
		return userAgent;
	}