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Draft: Use isc_mem_reget() when growing buffer dynamically

Closed Ondřej Surý requested to merge ondrej/use-isc_mem_reget-as-a-better-fit into 2917-preserve-the-contents-of-tcp-buffer

Previously, we cannot use isc_mem_reallocate() for growing the buffer dynamically, because the memory was allocated using the isc_mem_get()/isc_mem_put() API. With the introduction of the isc_mem_reget() function, we can use grow/shrink the memory directly without always moving the memory around as the allocator might have reserved some extra space after the initial allocation.