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CA-290491: do not leaf coalesce VDIs with allow_caching=true

SMGC's leaf coalescing isn't meant to happen on VDIs with caching
enabled.

It wasn't an issue before CP-18840, when the leaf coalescing was
completely disabled on file-based SR anyway. With CP-18840, we need
to be able more careful about this. This patch disables leaf
coalescing on cache-enabled VDIs and protect their VHD tree height
from being changed by leaf coalesce (to avoid disabling/enabling
cache unintentionally).

Signed-off-by: Zheng Li <zheng.li3@citrix.com>

828 of 6393 branches covered (12.95%)

7013 of 20851 relevant lines covered (33.63%)

0.34 hits per line