CLOUDSTACK-5272: return unlimit if max.account.* or max.project.* is set to negative
(cherry picked from commit 888ddd724aabbd22d675fe2bba873971888e1a8a)
    CLOUDSTACK-2940: Allowing Replacement of realhostip.com with a customized domain for SSVM
    (cherry picked from commit e23b10319f55fe8cbb822c0c29dc64b56509c119)

    Conflicts:

        plugins/storage/image/default/src/org/apache/cloudstack/storage/datastore/driver/CloudStackImageStoreDriverImpl.java
        server/src/com/cloud/storage/upload/UploadMonitorImpl.java
CLOUDSTACK-4505: allow domain admin to expunge a destroyed VM