Add a column to show if Extra Specs are defined on a Flavor

UX improvement: Adds a column to the Flavors DataTable to show if
any Extra Specs have been defined for the flavor.  Also contains a
LinkAction to open the Extra Specs view for the flavor

BP: extra-specs-as-column
Change-Id: I044b86c366c6687f4b0e9870371ef63a2066083d
Merge "Add a column to show if Extra Specs are defined on a Flavor"