GUI-1328 & GUI-1327 Added Keypair to the filter list and adjusted search bar to filter by security group on instance landing page

https://eucalyptus.atlassian.net/browse/GUI-1328
https://eucalyptus.atlassian.net/browse/GUI-1327
In this case, the itemProp is an object that contains a list of items with various attributes, for instance, it could be security group list objects, or some other list objects, such as security group rules list objects. Since it is a generic function, we will need to ensure that each item contains the attribute "name" to build up the flat string used for search.

Notice that .hasOwnProperty call is not made on the element x, which is the returned item from itemProp.