[feature required] pouch should support cpu-period and cpu-quota

[Letty5411]

Ⅰ. Issue Description

pouch create/run should also support the following args:

--cpu-period=0                  Limit CPU CFS (Completely Fair Scheduler) period
  --cpu-quota=0                   Limit CPU CFS (Completely Fair Scheduler) quota

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• pouch version (use pouch version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others:

[allencloud]

Could you help to handle this issue? @YaoZengzeng
In addition, I am wondering if we need to refactor the spec related go files in /pouch/daemon/mgr/spec_*.go?

Since they are some kind of casual. In the past, when we adding a field in spec, we simply add a spec_*.go file.

[Ace-Tang]

I think spec related implement is not so good, lots of files /pouch/daemon/mgr/spec_*.go make this
complex.
@Letty5411 , you can just add this two spec field.

[allencloud]

I think spec related implement is not so good, lots of files /pouch/daemon/mgr/spec_*.go make this
complex.

Actually I cannot quite follow you. @Ace-Tang
Could you explain more on the complexity?