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/service/redshift/service.go

@@ -0,0 +1,93 @@
+// Code generated by private/model/cli/gen-api/main.go. DO NOT EDIT.
+
+package redshift
+
+import (
+	"github.com/aws/aws-sdk-go/aws"
+	"github.com/aws/aws-sdk-go/aws/client"
+	"github.com/aws/aws-sdk-go/aws/client/metadata"
+	"github.com/aws/aws-sdk-go/aws/request"
+	"github.com/aws/aws-sdk-go/aws/signer/v4"
+	"github.com/aws/aws-sdk-go/private/protocol/query"
+)
+
+// Redshift provides the API operation methods for making requests to
+// Amazon Redshift. See this package's package overview docs
+// for details on the service.
+//
+// Redshift methods are safe to use concurrently. It is not safe to
+// modify mutate any of the struct's properties though.
+type Redshift struct {
+	*client.Client
+}
+
+// Used for custom client initialization logic
+var initClient func(*client.Client)
+
+// Used for custom request initialization logic
+var initRequest func(*request.Request)
+
+// Service information constants
+const (
+	ServiceName = "redshift"  // Service endpoint prefix API calls made to.
+	EndpointsID = ServiceName // Service ID for Regions and Endpoints metadata.
+)
+
+// New creates a new instance of the Redshift client with a session.
+// If additional configuration is needed for the client instance use the optional
+// aws.Config parameter to add your extra config.
+//
+// Example:
+//     // Create a Redshift client from just a session.
+//     svc := redshift.New(mySession)
+//
+//     // Create a Redshift client with additional configuration
+//     svc := redshift.New(mySession, aws.NewConfig().WithRegion("us-west-2"))
+func New(p client.ConfigProvider, cfgs ...*aws.Config) *Redshift {
+	c := p.ClientConfig(EndpointsID, cfgs...)
+	return newClient(*c.Config, c.Handlers, c.Endpoint, c.SigningRegion, c.SigningName)
+}
+
+// newClient creates, initializes and returns a new service client instance.
+func newClient(cfg aws.Config, handlers request.Handlers, endpoint, signingRegion, signingName string) *Redshift {
+	svc := &Redshift{
+		Client: client.New(
+			cfg,
+			metadata.ClientInfo{
+				ServiceName:   ServiceName,
+				SigningName:   signingName,
+				SigningRegion: signingRegion,
+				Endpoint:      endpoint,
+				APIVersion:    "2012-12-01",
+			},
+			handlers,
+		),
+	}
+
+	// Handlers
+	svc.Handlers.Sign.PushBackNamed(v4.SignRequestHandler)
+	svc.Handlers.Build.PushBackNamed(query.BuildHandler)
+	svc.Handlers.Unmarshal.PushBackNamed(query.UnmarshalHandler)
+	svc.Handlers.UnmarshalMeta.PushBackNamed(query.UnmarshalMetaHandler)
+	svc.Handlers.UnmarshalError.PushBackNamed(query.UnmarshalErrorHandler)
+
+	// Run custom client initialization if present
+	if initClient != nil {
+		initClient(svc.Client)
+	}
+
+	return svc
+}
+
+// newRequest creates a new request for a Redshift operation and runs any
+// custom request initialization.
+func (c *Redshift) newRequest(op *request.Operation, params, data interface{}) *request.Request {
+	req := c.NewRequest(op, params, data)
+
+	// Run custom request initialization if present
+	if initRequest != nil {
+		initRequest(req)
+	}
+
+	return req
+}