Allow for length of password on VMs to be set via global settings

    Conflicts:
        server/src/com/cloud/vm/UserVmManagerImpl.java
        setup/db/db/schema-430to440.sql
remove unused import
CLOUDSTACK-7005 - Failed to start MS with latest 4.4 RPM builds

Conflicts:
	setup/db/db/schema-430to440.sql