add go mysql redis sample

Signed-off-by: vishal979 <shantapowertech2@gmail.com>

go-mysql-redis/vendor/gopkg.in/redis.v5/redis_context.go

@@ -0,0 +1,35 @@
+// +build go1.7
+
+package redis
+
+import (
+	"context"
+
+	"gopkg.in/redis.v5/internal/pool"
+)
+
+type baseClient struct {
+	connPool pool.Pooler
+	opt      *Options
+
+	process func(Cmder) error
+	onClose func() error // hook called when client is closed
+
+	ctx context.Context
+}
+
+func (c *Client) Context() context.Context {
+	if c.ctx != nil {
+		return c.ctx
+	}
+	return context.Background()
+}
+
+func (c *Client) WithContext(ctx context.Context) *Client {
+	if ctx == nil {
+		panic("nil context")
+	}
+	c2 := c.copy()
+	c2.ctx = ctx
+	return c2
+}