Don't provide both region and endpoint to S3 connector

ERROR [http-nio-0.0.0.0-8080-exec-1] [org.nuxeo.ecm.webengine.app.WebEngineExceptionMapper] java.lang.IllegalStateException: Only one of Region or EndpointConfiguration may be set.
	at com.amazonaws.client.builder.AwsClientBuilder.setRegion(AwsClientBuilder.java:359)
	at com.amazonaws.client.builder.AwsClientBuilder.configureMutableProperties(AwsClientBuilder.java:337)
	at com.amazonaws.client.builder.AwsSyncClientBuilder.build(AwsSyncClientBuilder.java:46)
	at org.nuxeo.ecm.core.storage.sql.S3BinaryManager.setupCloudClient(S3BinaryManager.java:350)
	at org.nuxeo.ecm.blob.AbstractCloudBinaryManager.initialize(AbstractCloudBinaryManager.java:114)
	at org.nuxeo.ecm.core.blob.BlobManagerComponent.getBlobProvider(BlobManagerComponent.java:167)
	at org.nuxeo.ecm.core.blob.DocumentBlobManagerComponent.getBlobProvider(DocumentBlobManagerComponent.java:105)
	at org.nuxeo.ecm.core.blob.DocumentBlobManagerComponent.getBlobProvider(DocumentBlobManagerComponent.java:145)
	at org.nuxeo.ecm.core.blob.DocumentBlobManagerComponent.readBlob(DocumentBlobManagerComponent.java:128)