[sr-dev] [kamailio/kamailio] Body part comparison error logs (#1746)

[Y. Luis]

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### Description
I used [get_body_part_by_filter](https://github.com/kamailio/kamailio/blob/f073f72af6a507e8113e06dc07ad161e3f4632c3/src/core/parser/parse_body.c#L528) to extract a body part from a `multipart/mixed` message. It works as expected but for every body part it compares and do not match (until finding the one that matches the filter) it shows error log messages like:

`ERROR: <core> [core/parser/parse_body.c:513]: part_multipart_headers_cmp(): part_multipart_headers_cmp. error. "-2". "MIME types mismatch".`

The comparison of body parts shouldn´t be logged as errors, since they are not.

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Explain what you did, what you expected to happen, and what actually happened.
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### Expected behavior

No error logs.

#### Actual observed behavior

Error log messages.

#### Log Messages

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Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site).
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```
ERROR: <core> [core/parser/parse_body.c:513]: part_multipart_headers_cmp(): part_multipart_headers_cmp. error. "-2". "MIME types mismatch".
```
### Possible Solutions

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Do not show logs or change log level.

### Additional Information

  * **Kamailio Version** - output of `kamailio -v`

```
5.1
```

* **Operating System**:

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Kernel details (output of `uname -a`)
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```
CentOS 7
```


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