How to wrap a fields or other elements in div block?
In case you want a simpler answer with no coding needed just use Views Fieldset.
So install the module, add your row class on the view (Format > Settings > Row Class). 

Then add a fieldset (Fields > Add > Global: Fieldset), in the settings of the fieldset choose div and to the HTML classes add the column classes. Don't forget to to go to Fields > Rearrange and put your fields in the fieldset group.

That's it.