BUG/MINOR: proxy/stktable: missing frees on proxy cleanup

In 1b8e68e ("MEDIUM: stick-table: Stop handling stick-tables as proxies.")
we forgot to free the table pointer which is now dynamically allocated.

Let's take this opportunity to also fix a missing free in the table itself
(the table expire task wasn't properly destroyed)

This patch depends on:
 - "MINOR: stktable: add sktable_deinit function"

It should be backported in every stable versions.

src/proxy.c

@@ -389,7 +389,9 @@ void free_proxy(struct proxy *p)
 
 	pool_destroy(p->req_cap_pool);
 	pool_destroy(p->rsp_cap_pool);
+
 	stktable_deinit(p->table);
+	ha_free(&p->table);
 
 	HA_RWLOCK_DESTROY(&p->lbprm.lock);
 	HA_RWLOCK_DESTROY(&p->lock);

src/stick_table.c

@@ -875,6 +875,7 @@ void stktable_deinit(struct stktable *t)
 {
 	if (!t)
 		return;
+	task_destroy(t->exp_task);
 	pool_destroy(t->pool);
 }