Assigning uint64_t from buffer might be misaligned in netmgr tests
requested to merge 2455-tcpdns_test-c-runtime-error-load-of-misaligned-address-for-type-uint64_t-v9_16 into v9_16
Resolve possible 8-byte unaligned access when assigning the magic value from the received buffer.
(cherry picked from commit a55bdb28)
Closes #2455 (closed)