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Physical segments were still allocated from global
command context mempool.
This leads to very high memory usage when
activating large VG (vgchange).
(Memory usage was about 2G when >3000LVs).
Fix it by properly using vg->vgmem private pool,
so all the memory is released early.
New memory pool parameter is needed here for pv_split_segment
function.
Also fix the same problem in some minor allocations
(vg description, lv segment split).
In addition to previous patch, we really do not need
to search for segment which was just allocated in
split request.
Make pv_split_segment function return newly allocated
(split) segment also.
(So after this patch, there is only one user
of slow find_peg_by_pe).
