send-pack: free cas options before exit

The send-pack --force-with-lease option populates a push_cas_option
struct with allocated strings. Exiting without cleaning this up will
cause leak-checkers to complain.

We can fix this by calling clear_cas_option(), after making it publicly
available. Previously it was used only for resetting the list when we
saw --no-force-with-lease.

The git-push command has the same "leak", though in this case it won't
trigger a leak-checker since it stores the push_cas_option struct as a
global rather than on the stack (and is thus reachable even after main()
exits). I've added cleanup for it here anyway, though, as
future-proofing.

The leak is triggered by t5541 (it tests --force-with-lease over http,
which requires a separate send-pack process under the hood), but we
can't mark it as leak-free yet.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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