Replace minio-go with aws-sdk-go for s3-compatible log backend (#670)

* Logs should support specifying region when using S3-compatible object store

* Use aws-sdk-go client for s3 backed logstore

* fixes vendor with aws-sdk-go dependencies

vendor/github.com/aws/aws-sdk-go/models/apis/elastictranscoder/2012-09-25/examples-1.json

@@ -0,0 +1,5 @@
+{
+  "version": "1.0",
+  "examples": {
+  }
+}

vendor/github.com/aws/aws-sdk-go/models/apis/elastictranscoder/2012-09-25/paginators-1.json

@@ -0,0 +1,24 @@
+{
+  "pagination": {
+    "ListJobsByPipeline": {
+      "input_token": "PageToken",
+      "output_token": "NextPageToken",
+      "result_key": "Jobs"
+    },
+    "ListJobsByStatus": {
+      "input_token": "PageToken",
+      "output_token": "NextPageToken",
+      "result_key": "Jobs"
+    },
+    "ListPipelines": {
+      "input_token": "PageToken",
+      "output_token": "NextPageToken",
+      "result_key": "Pipelines"
+    },
+    "ListPresets": {
+      "input_token": "PageToken",
+      "output_token": "NextPageToken",
+      "result_key": "Presets"
+    }
+  }
+}

vendor/github.com/aws/aws-sdk-go/models/apis/elastictranscoder/2012-09-25/waiters-2.json

@@ -0,0 +1,30 @@
+{
+  "version": 2,
+  "waiters": {
+    "JobComplete": {
+      "delay": 30,
+      "operation": "ReadJob",
+      "maxAttempts": 120,
+      "acceptors": [
+        {
+          "expected": "Complete",
+          "matcher": "path",
+          "state": "success",
+          "argument": "Job.Status"
+        },
+        {
+          "expected": "Canceled",
+          "matcher": "path",
+          "state": "failure",
+          "argument": "Job.Status"
+        },
+        {
+          "expected": "Error",
+          "matcher": "path",
+          "state": "failure",
+          "argument": "Job.Status"
+        }
+      ]
+    }
+  }
+}