HADOOP-18481. AWS v2 SDK upgrade log to not about standard AWS Creden…

…tial Providers. (apache#4973)

The AWS SDKV2 upgrade log no longer warns about instantiation
of the v1 SDK credential providers which are commonly used in
s3a configurations:

* com.amazonaws.auth.EnvironmentVariableCredentialsProvider
* com.amazonaws.auth.EC2ContainerCredentialsProviderWrapper
* com.amazonaws.auth.InstanceProfileCredentialsProvider

When the hadoop-aws module moves to the v2 SDK, references to these
credential providers will be rewritten to their v2 equivalents.

Follow-on to HADOOP-18382. "Upgrade AWS SDK to V2 - Prerequisites"

Contributed by Ahmar Suhail

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AUtils.java

@@ -638,7 +638,10 @@ public static AWSCredentialProviderList buildAWSProviderList(
     AWSCredentialProviderList providers = new AWSCredentialProviderList();
     for (Class<?> aClass : awsClasses) {
 
-      if (aClass.getName().contains(AWS_AUTH_CLASS_PREFIX)) {
+      // List of V1 credential providers that will be migrated with V2 upgrade
+      if (!Arrays.asList("EnvironmentVariableCredentialsProvider",
+              "EC2ContainerCredentialsProviderWrapper", "InstanceProfileCredentialsProvider")
+          .contains(aClass.getSimpleName()) && aClass.getName().contains(AWS_AUTH_CLASS_PREFIX)) {
         V2Migration.v1ProviderReferenced(aClass.getName());
       }