useNonce attribute on org.mitre.openid.connect.config.ServerConfiguration

Following our discussions on pull request (#680), we remove the issuer normalization and added the useNonce attribute in “org.mitre.openid.connect.config.ServerConfiguration” and changes classes "org.mitre.openid.connect.client.service.impl.PlainAuthRequestUrlBuilder" and "org.mitre.openid.connect.client.OIDCAuthenticationFilter" to use the isUseNonce value from serverConfiguration variable to indicate if the IdP accepts or not a nonce value.