Support for multiline processing as log options

[iamyogeshg]

Currently there is no support for multilineprocessing of docker logs in sumologic driver plugin. It'd be nice to have this.

[samjsong]

Unfortunately this seems to be a limitation of docker logging drivers in general: moby/moby#22920

However, you can set multiline boundary regex configuration at the Collector level by following the steps detailed in this doc. Hope this helps!