Move OptionList key attribute to Option

[rogerdahl]

OptionList has a key attribute which should be on Option. The OptionList description attr may have been intended to be on Option as well.

<ns2:optionList key="views" description="List of views for objects on the node">
<option>default</option>
<option>metacatui</option>
<option>nceas</option>
<option>esa</option>
<option>knb</option>
<option>kepler</option>
<option>lter</option>
<option>ltss</option>
<option>obfs</option>
<option>nrs</option>
<option>sanparks</option>
<option>saeon</option>
<option>first</option>
<option>parc</option>
<option>dataone</option>
</ns2:optionList>