Revert "Remove unused private constructor"

This reverts commit 57750b1.

spring-security-kerberos-client/src/main/java/org/springframework/security/kerberos/client/KerberosRestTemplate.java

@@ -163,6 +163,23 @@ public KerberosRestTemplate(String keyTabLocation, String userPrincipal, String
 		this(keyTabLocation, userPrincipal, password, loginOptions, buildHttpClient());
 	}
 
+	/**
+	 * Instantiates a new kerberos rest template.
+	 *
+	 * @param keyTabLocation the key tab location
+	 * @param userPrincipal the user principal
+	 * @param password the password
+	 * @param loginOptions the login options
+	 * @param httpClient the http client
+	 */
+	private KerberosRestTemplate(String keyTabLocation, String userPrincipal, String password, Map<String, Object> loginOptions, HttpClient httpClient) {
+		super(new HttpComponentsClientHttpRequestFactory(httpClient));
+		this.keyTabLocation = keyTabLocation;
+		this.userPrincipal = userPrincipal;
+		this.password = password;
+		this.loginOptions = loginOptions;
+	}
+
 	/**
 	 * Builds the default instance of {@link HttpClient} having kerberos
 	 * support.