[pmon] pcied keeps reporting warning

[bingwang-ms]

Description
pcied in pmon container keeps printing warning logs

Nov  5 05:44:18.057668 str-dx010-acs-4 WARNING pmon#pcied[125]: Failed to load platform-specific PcieUtil module. Falling back to the common implementation

It is generated by following code

try:
            platform_path, _ = device_info.get_paths_to_platform_and_hwsku_dirs()
            platform_plugins_path = os.path.join(platform_path, "plugins")
            sys.path.append(os.path.abspath(platform_plugins_path))
            self.log_warning("plugin path = {}".format(os.path.abspath(platform_plugins_path)))
            from pcieutil import PcieUtil
        except ImportError as e:
            self.log_warning("Failed to load platform-specific PcieUtil module. Falling back to the common implementation")
            try:
                from sonic_platform_base.sonic_pcie.pcie_common import PcieUtil
                platform_pcieutil = PcieUtil(platform_plugins_path)
            except ImportError as e:
                self.log_error("Failed to load default PcieUtil module. Error : {}".format(str(e)), True)
                raise e

I checked the utils in /usr/share/sonic/platform/plugins and found no pcieutil library.

Steps to reproduce the issue:
The log is alway printing even no test case is running.
1.
2.
3.

Describe the results you received:

Describe the results you expected:

Additional information you deem important (e.g. issue happens only occasionally):

**Output of `show version`:**

SONiC Software Version: SONiC.master.469-84d3a260
Distribution: Debian 10.6
Kernel: 4.19.0-9-2-amd64
Build commit: 84d3a260
Build date: Wed Nov  4 00:55:31 UTC 2020
Built by: johnar@jenkins-worker-8

Platform: x86_64-cel_seastone-r0
HwSKU: Celestica-DX010-C32
ASIC: broadcom
Serial Number: DX010F2B118711MS100007
Uptime: 05:55:15 up 11:22,  3 users,  load average: 4.56, 3.05, 2.51

Docker images:
REPOSITORY                    TAG                   IMAGE ID            SIZE
docker-snmp                   latest                e21c75cf3e75        427MB
docker-snmp                   master.469-84d3a260   e21c75cf3e75        427MB
docker-teamd                  latest                93c913c5a017        425MB
docker-teamd                  master.469-84d3a260   93c913c5a017        425MB
docker-sonic-mgmt-framework   latest                244b796dd024        551MB
docker-sonic-mgmt-framework   master.469-84d3a260   244b796dd024        551MB
docker-router-advertiser      latest                c31265cbdcd2        390MB
docker-router-advertiser      master.469-84d3a260   c31265cbdcd2        390MB
docker-platform-monitor       latest                106e63b358ad        503MB
docker-platform-monitor       master.469-84d3a260   106e63b358ad        503MB
docker-lldp                   latest                9ba8b14bb844        456MB
docker-lldp                   master.469-84d3a260   9ba8b14bb844        456MB
docker-dhcp-relay             latest                d48a5f726cd7        397MB
docker-dhcp-relay             master.469-84d3a260   d48a5f726cd7        397MB
docker-database               latest                9af7507f9821        390MB
docker-database               master.469-84d3a260   9af7507f9821        390MB
docker-orchagent              latest                6276adebac5b        439MB
docker-orchagent              master.469-84d3a260   6276adebac5b        439MB
docker-nat                    latest                0a1ee7e92192        428MB
docker-nat                    master.469-84d3a260   0a1ee7e92192        428MB
docker-sonic-telemetry        latest                e387512c848f        459MB
docker-sonic-telemetry        master.469-84d3a260   e387512c848f        459MB
docker-fpm-frr                latest                0a87f992c6a5        441MB
docker-fpm-frr                master.469-84d3a260   0a87f992c6a5        441MB
docker-sflow                  latest                c5edda64f062        429MB
docker-sflow                  master.469-84d3a260   c5edda64f062        429MB
docker-syncd-brcm             latest                bac1974ef6a7        527MB
docker-syncd-brcm             master.469-84d3a260   bac1974ef6a7        527MB    

**Attach debug file `sudo generate_dump`:**

```
(paste your output here)
```

[lguohan]

@sujinmkang , can you take a look?

[yxieca]

@sujinmkang, @jleveque can you assess if this issue is still applicable to latest image?

[sujinmkang]

I will clean up this message. There is no platforms which have platform api implemented.