Tweaked Shotgun filter when only one Entity is to be returned by a job

Switched the search filter from an "in" to a "is" when only one entity
id is present.
Added extra debug call in SgEntity.valuesSg to show the pulling fields

valuesSg only output to the logger what fields were passed to the
the function.  Because the list of fields is checked for if they are
queryable now the debug logger will also print the fields that passed
the queryable test.