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
Fixed status on Cell class

The status property was reading the column's data which could be translated
and would not match the STATUS_CHOICES post translation.
Therefore, in any other languages the get_status_class method was always
returning "status_unknown" when in a non english locale.

Change-Id: I5194507816631f9c59656d393af4cb7bc22336f6
Closes-Bug: 1319284
Merge "Fixed status on Cell class"
Merge "Add a column to show if Extra Specs are defined on a Flavor"