List view: Fix issue with multiple selection actions

Fixes issue where duplicate and/or incorrect list view entries were
being passed due to list view object not being referenced relatively for
multi-select actions, causing more than one list being passed at times.
Fixed Coverity reported performance issues like inefficient string concatenations, wrong boxing or unboxing types, inefficent map element retrievals

Signed-off-by: Daan Hoogland <daan@onecht.net>
remove unused directory
Polish IPv6 input error information
CLOUDSTACK-7032 bugfix: listVolumes throws an error

Since schema change made on 4.4 is not applied to the upgrade script
from 4.4 to 4.5, listVolumes api throws an error.
This commit fix the issue.