CLOUDSTACK-8070: Upgrade router.ram.size using encryption util

Upgrade fails if value is set using plain text encoding, the value needs to
be encrypted (if a key was provided during db was setup).

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
(cherry picked from commit 6321a29e4336de9ffe96e27968f896ec5a8bf37d)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>