CLOUDSTACK-7110: introduced by c1116142a3cd356e1e8da5404be150a07752b5d5, if it's a data volume, mgt server doesn't send image format to agent
CLOUDSTACK-7123: set the timeout to 60s, when run the file command
CLOUDSTACK-6358: KVM mappings for CentOS 6.x and RHEL 6.x
CLOUDSTACK-6918: iterate through pending works in cancel maitenance