CLOUDSTACK-8014: Fix NPE searching including removed templates

Steps to reproduce if you have this issue:
- Create a VM's volume snapshot
- Remove VM's template and mark the template as removed with timestamp in DB
- Restart mgmt server and create a volume out of snapshot you should get NPE

Fix: In `storagePoolHasEnoughSpace`, we're only searching for a VM's volume's
snapshot's template by Id and not including removed templates. This is a corner
case and NPE hits when template has been marked removed for a VM's volume's
template so we should search including removed templates.

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