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/jmespath/go-jmespath/api_test.go

@@ -0,0 +1,32 @@
+package jmespath
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestValidPrecompiledExpressionSearches(t *testing.T) {
+	assert := assert.New(t)
+	data := make(map[string]interface{})
+	data["foo"] = "bar"
+	precompiled, err := Compile("foo")
+	assert.Nil(err)
+	result, err := precompiled.Search(data)
+	assert.Nil(err)
+	assert.Equal("bar", result)
+}
+
+func TestInvalidPrecompileErrors(t *testing.T) {
+	assert := assert.New(t)
+	_, err := Compile("not a valid expression")
+	assert.NotNil(err)
+}
+
+func TestInvalidMustCompilePanics(t *testing.T) {
+	defer func() {
+		r := recover()
+		assert.NotNil(t, r)
+	}()
+	MustCompile("not a valid expression")
+}