Revert "Bump release version to 4.3.2-SNAPSHOT and add empty db upgrade path"

This reverts commit c3c3bab41a2734a1f0e67065b52c5233bb64d023.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
CLOUDSTACK-7415. Host remains in Alert after vCenter restart.
Management server PingTask should update PingMap entry for an agent only if it is already present in the Management Server's PingMap.

(cherry picked from commit 8ce6eba549bcd3fa007aaf10a29c3a2fef9ffaaa)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>