**- What I did**
Add support of **platform.json** parsing to **portconfig.py** file which is being used by **_sonic-cfggen_** and ***minigraph.py*** file under ***src/sonic-config-engine*** folder to get port config via get_port_config function.
**- How I did it**
1. **portconfig.py** file will first check whether the **platform.json** file is there or not. if not then whether port_config.ini file is there or not. Modified **get_port_config_file_name** for this purpose.
2. Added two separate functions i.e. **parse_platform_json_file** to get port attributes from **platform.json** and **gen_port_config** to generate port attributes.
3. Added another two functions i.e get_breakout_mode parse_breakout_mode to get breakout mode and parse breakout mode from platform.json respectively.
**- How to verify it**
rebuilt "sonic_config_engine-1.0" wheel package with all the test cases.All the below-mentioned test cases passed.
```
# Check whether all interfaces present or not as per platform.json
def test_platform_json_interfaces_keys(self):
# Check specific Interface with it's proper configuration as per platform.json
def test_platform_json_specific_ethernet_interfaces(self):
# Check all Interface with it's proper configuration as per platform.json
def test_platform_json_all_ethernet_interfaces(self):
```
Signed-off-by: Sangita Maity <sangitamaity0211@gmail.com>
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