fixed binary attachments generation from comments. resolves #1933

[khaliullov]

Describe the PR
problems is well described in #1933

now --v3.1 will generate from comments like

// @Accept	 multipart/form-data
// @Param        data formData file true "Module package .zip file"

following swagger:

    post:
      description: Upload a module package ZIP file.
      requestBody:
        content:
          multipart/form-data:
            schema:
              properties:
                data:
                  format: binary
                  type: file
              type: object
        description: Module package .zip file
        required: true

Relation issue
Issue #1933