schema: Add upgrade paths from 4.3.2 to 4.4.0

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>
Fixed CLOUDSTACK-7937 CloudStack accepts unauthenticated LDAP binds

added validation checks for empty username and password and debug logs
when that happens.

Signed-off-by: Daan Hoogland <daan@onecht.net>