Adding GetConfig operation for Rackspace provider
diff --git a/rackspace/db/v1/instances/requests_test.go b/rackspace/db/v1/instances/requests_test.go
new file mode 100644
index 0000000..e653c07
--- /dev/null
+++ b/rackspace/db/v1/instances/requests_test.go
@@ -0,0 +1,65 @@
+package instances
+
+import (
+	"testing"
+
+	th "github.com/rackspace/gophercloud/testhelper"
+	fake "github.com/rackspace/gophercloud/testhelper/client"
+)
+
+func TestGetConfig(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	HandleGetConfigSuccessfully(t)
+
+	config, err := GetConfig(fake.ServiceClient(), opts).Extract()
+
+	expected := map[string]string{
+		"basedir":                      "/usr",
+		"connect_timeout":              "15",
+		"datadir":                      "/var/lib/mysql",
+		"default_storage_engine":       "innodb",
+		"innodb_buffer_pool_instances": "1",
+		"innodb_buffer_pool_size":      "175M",
+		"innodb_checksum_algorithm":    "crc32",
+		"innodb_data_file_path":        "ibdata1:10M:autoextend",
+		"innodb_file_per_table":        "1",
+		"innodb_io_capacity":           "200",
+		"innodb_log_file_size":         "256M",
+		"innodb_log_files_in_group":    "2",
+		"innodb_open_files":            "8192",
+		"innodb_thread_concurrency":    "0",
+		"join_buffer_size":             "1M",
+		"key_buffer_size":              "50M",
+		"local-infile":                 "0",
+		"log-error":                    "/var/log/mysql/mysqld.log",
+		"max_allowed_packet":           "16M",
+		"max_connect_errors":           "10000",
+		"max_connections":              "40",
+		"max_heap_table_size":          "16M",
+		"myisam-recover":               "BACKUP",
+		"open_files_limit":             "8192",
+		"performance_schema":           "off",
+		"pid_file":                     "/var/run/mysqld/mysqld.pid",
+		"port":                         "3306",
+		"query_cache_limit":            "1M",
+		"query_cache_size":             "8M",
+		"query_cache_type":             "1",
+		"read_buffer_size":             "256K",
+		"read_rnd_buffer_size":         "1M",
+		"server_id":                    "1",
+		"skip-external-locking":        "1",
+		"skip_name_resolve":            "1",
+		"sort_buffer_size":             "256K",
+		"table_open_cache":             "4096",
+		"thread_stack":                 "192K",
+		"tmp_table_size":               "16M",
+		"tmpdir":                       "/var/tmp",
+		"user":                         "mysql",
+		"wait_timeout":                 "3600",
+	}
+
+	th.AssertNoErr(t, err)
+	th.AssertDeepEquals(t, expected, config)
+}