lib/sdp: Add missing Service Class ID for GAP

Also reorder last ID so the list remains ordered.
tools/sdptool: Fix output formatting

Print 8-bit and 16-bit integers with in a more readable format.
lib/sdp: Fix printing of multiple record fields

If there are multiple fields to print, sdp_record_print() was missing a
newline between entries.
unit: Fix memory leaks in gobex tests