bettter display for temporary Ada exception catchpoints

bettter display for temporary Ada exception catchpoints

Temporary catchpoints on Ada exceptions are now displayed as "Temporary
catchpoint" as opposed to just "Catchpoint".  This is cosmetic only, but
in line with what's done for other catchpoints as well as breakpoints.

gdb/ChangeLog:

        * ada-lang.c (print_it_exception): Print temporary catchpoints
        as "Temporary catchpoint".
        (print_mention_exception): Likewise.

gdb/testsuite/ChangeLog:

        * gdb.ada/catch_ex.exp: Add temporary catchpoint tests.