CLOUDSTACK-7495. Volume resize is only supported on kvm, vmware and xenserver. If
the operation is tried on other hypervisors it fails but logs a stack trace. We
should just log a message that the operation isn't supported.
CLOUDSTACK-7575: improved performance of cleanString method in StringUtils
CLOUDSTACK-7610,CLOUDSTACK-7611,CLOUDSTACK-7612: Fixed following bugs in AlertsSyslogAppender 1. Added sync alert. 2. Changed unrecognised alerts are send as unknown instead of null. 3. Added unit tests to cover some more scenarios.