CLOUDSTACK-8070: during 4.4.2 to 4.4.3 upgrade encrypt config that are hidden

In case there is an encryption key/password is provided the value, specifically
for router.ram.size will be encrypted otherwise it will remain plain text.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
engine: Fix build regression

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>