[feature] Support STDOUT/STDERR stream redirection in Python SDK

[gaocegege]

Is this a BUG REPORT or FEATURE REQUEST?:

/kind feature

What happened:

Now we will not output the STDOUT/STDERR of ormb when we use Python SDK in Jupyter:

It will output in jupyter server's log:

[I 11:32:18.356 LabApp] Saving file at /examples/SavedModel-fashion/training-serving.ipynb
Using config file: /home/gaocegege/.ormb/config.json
Using /home/gaocegege/.ormb as the root path
Error: open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Usage:
  ormb save [flags]

Flags:
  -h, --help   help for save

Global Flags:
      --config string   config file (default is $HOME/.ormb/config.yaml)

open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Using config file: /home/gaocegege/.ormb/config.json
Using /home/gaocegege/.ormb as the root path
Error: open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Usage:
  ormb save [flags]

Flags:
  -h, --help   help for save

Global Flags:
      --config string   config file (default is $HOME/.ormb/config.yaml)

open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Using config file: /home/gaocegege/.ormb/config.json
Using /home/gaocegege/.ormb as the root path
Error: open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Usage:
  ormb save [flags]

Flags:
  -h, --help   help for save

Global Flags:
      --config string   config file (default is $HOME/.ormb/config.yaml)

open /tmp/ormb_73pss1e/1/ormbfile.yaml: no such file or directory
Using config file: /home/gaocegege/.ormb/config.json
Using /home/gaocegege/.ormb as the root path
The push refers to repository [demo.goharbor.io/tensorflow/fashion_model]
ref:       demo.goharbor.io/tensorflow/fashion_model:v1
digest:    13eb538942a70c699637cfa1bb9c7d72cd8430af50a992055b7bfd3220042e94
size:      162.1 KiB
format:    SavedModel
Error: unexpected response: 401 Unauthorized
Usage:
  ormb push [flags]

Flags:
  -h, --help         help for push
      --plain-http   use plain http and not https

Global Flags:
      --config string   config file (default is $HOME/.ormb/config.yaml)

unexpected response: 401 Unauthorized
[I 11:34:18.493 LabApp] Saving file at /examples/SavedModel-fashion/training-serving.ipynb

What you expected to happen:

We expect that the STDOUT/STDERR of ormb should be redirected to the cell output.

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?: