Put passwords in secrets instead of configmaps

[vflaux]

Bug report:

Redis & MySQL passwords are stored in Configmaps.

Expected behavior:

Password should be in Secrets.

How to reproduce it:

N/A

Environment:

• Dragonfly version: N/A
• OS: N/A
• Kernel (e.g. uname -a): N/A
• Others: N/A

[gaius-qi]

I think it's a good idea, you can try to support it.