after apply_view, use malloc_trim to release memory to system #1400
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why I did:
after warm-reboot with all vlan members, syncd use memory up to 1.8g,
and can not reduce to its normal state.
what I did:
this come from the glibc behavior, in the main heap, it almost not release
memory to system, in apply view, huge memory used for compare logic, and
do not use it again. so I add malloc_trim to release it.