Including following steps:
b. Run "cloudstack-agent-upgrade". This script will upgrade all the existing bridge name to new bridge name, and update related firewall rules.
c. install a libvirt hook:
c1. mkdir /etc/libvirt/hooks
c2. cp /usr/share/cloudstack-agent/lib/libvirtqemuhook /etc/libvirt/hooks/qemu
c3. chmod +x /etc/libvirt/hooks/qemu
c4. service libvirtd restart
(cherry picked from commit a0988780ad88bb56becb0a13efedcd79c1bee142)
Signed-off-by: Wei Zhou <w.zhou@leaseweb.com>