CLOUDSTACK-7590 Deletion of Account is not deleting the account from the database

Revert "CLOUDSTACK-7073: Added domainId field to the user table in order to restrict duplicated users creation on the db level"

This reverts commit 5a96d8ef5cbc88df366016ae9dd7ee46e4ca417a.

Conflicts:
	setup/db/db/schema-440to450.sql
Added a "long getUsedIops(StoragePool)" method to the PrimaryDataStoreDriver interface
CLOUDSTACK-7876 - Fixed the script 'test_vpc_vm_life_cycle.py' - Destruction of VM before it can be recovered needs to be prevented
CLOUDSTACK-7892: UI > network > detailView > execute handlers attached to event 'cloudStack.module.sharedFunctions.addExtraProperties'.
CLOUDSTACK-7892: UI > Infrastructure > zone > physical network > guest > details tab > network tab > detail view > execute handlers attached to event 'cloudStack.module.sharedFunctions.addExtraProperties'.
CLOUDSTACK-7891 - Fix failure in integration.component.test_escalations_instances.TestInstances/test_15_revert_vm_to_snapshot
CLOUDSTACK-7892: UI > Infrastructure > zones > zone > detailView > execute handlers attached to event 'cloudStack.module.sharedFunctions.addExtraProperties'.
CLOUDSTACK-7892: UI > stroage > volume > detailView > execute handlers attached to event 'cloudStack.module.sharedFunctions.addExtraProperties'.
CLOUDSTACK-7892: UI > instances > detailView > execute handlers attached to event 'cloudStack.module.sharedFunctions.addExtraProperties'.
CLOUDSTACK-7812: Fixed the script 'maint/test_redundant_router_network_rules.py' - Test Cases failing on Simulator due to hardware resources requirement for test execution
CLOUDSTACK-7811: Fixed the script 'test_persistent_networks.py' - Test Cases failing on Simulator due to hardware resources requirement for test execution
CLOUDSTACK-7786: Fixed the script 'test_haproxy.py' to be run only on hardware
CLOUDSTACK-7787: Fixed the script 'test_lb_secondary_ip.py' to be run only on hardware
CLOUDSTACK-7788: Fixed the script 'test_dynamic_compute_offering.py' to be run only on hardware