Addressing PR comments and checkstyle issue

Author: shameersss1

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

@@ -197,7 +197,7 @@ public AwsCredentials resolveCredentials() {
       } catch (SdkException e) {
         lastException = e;
         LOG.debug("No credentials provided by {}: {}",
-            provider, e);
+            provider, e.toString(), e);
       } catch (Exception e) {
         // convert any other exception into SDKException.
         // This is required because some credential provider like
@@ -207,7 +207,7 @@ public AwsCredentials resolveCredentials() {
           lastException = SdkException.create(e.getMessage(), e);
         }
         LOG.debug("No credentials provided by {}: {}",
-            provider, e);
+            provider, e.toString(), e);
       }
     }
 

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/TestS3AAWSCredentialsProvider.java

@@ -47,7 +47,6 @@
 import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
 import software.amazon.awssdk.auth.credentials.EnvironmentVariableCredentialsProvider;
 import software.amazon.awssdk.auth.credentials.InstanceProfileCredentialsProvider;
-import software.amazon.awssdk.core.exception.SdkException;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.Path;