Changes to support selection of appropriate alias from a keystore with multiple alias entries

Author: rahulnirgude

clients/src/main/java/org/apache/kafka/common/security/ssl/DefaultSslEngineFactory.java

@@ -424,7 +424,6 @@ static class FileBasedStore implements SecurityStore {
         protected final Password keyPassword;
         private final Long fileLastModifiedMs;
         private final KeyStore keyStore;
-        private final boolean pathAsBase64EncodedString;
 
         FileBasedStore(String type, String path, Password password, Password keyPassword, boolean isKeyStore) {
             Objects.requireNonNull(type, "type must not be null");