syslogs error logs "sflowmgrd is not running"

[banagiri]

Description

monit tool is logging error logs in syslog as "sflowd is not running", which is causing the log analyzer from ptf to fail

Steps to reproduce the issue:

1. config reload or reboot

Describe the results you received:
Error logs
sonic ERR monit[377]: 'sflowmgrd' process is not running

root@sonic:/home/admin# systemctl status sflow
● sflow.service
   Loaded: masked (Reason: Unit sflow.service is masked.)
   Active: inactive (dead) since Fri 2019-02-15 05:26:42 UTC; 10min ago
Main PID: 14583 (code=exited, status=0/SUCCESS)

Describe the results you expected:
No errors to be logged

Additional information you deem important (e.g. issue happens only occasionally):
This relates to
#4137
sonic-net/sonic-utilities#944

**Output of `show version`:**

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

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

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

[banagiri]

@jleveque @yozhao101

This can be fixed by enabling sflow service in init_cfg.json.j2.
But need to know what is the reason for disabling sflow? was it causing delayed startup or any ?
Why the monit script is checking for a disabled service?

[yozhao101]

Why the monit script is checking for a disabled service?

The Monit to monitor the processes in sflow container is merged into repo before sflow service is disabled. Right now I am working on the solution which will not monitor the processes in the service according to whether such service is enabled or disabled in configuration file.