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## Skip pfcwd config if it's disabled in golden config

In `sudo config load_minigraph --override_config -y`,  it will call `pfcwd start_default` by default.
```
Running command: /usr/local/bin/sonic-cfggen -H -m -j /etc/sonic/init_cfg.json --write-to-db
......
Running command: pfcwd start_default
Running command: config override-config-table /etc/sonic/golden_config_db.json
```

When golden_config_db.json has `"default_pfcwd_status": disable`, pfcwd should not be generated in the config.
However, in current code, when `pfcwd start_default` is called, the `default_pfcwd_status` is still using the value in `init_cfg.json` which is `enable`.  So, pfcwd configuration is still generated even though it's not needed.

#### What I did
Disable default_pfcwd_status for all lossy platform.

#### How I did it
Check `default_pfcwd_status` in `golden_config_db.json` and skip `pfcwd start_default` if it's disabled.

#### How to verify it

Run deploy-mg on all lossy platform

#### Previous command output (if the output of a command-line utility has changed)

#### New command output (if the output of a command-line utility has changed)