CA-128803: do not take timeoffset from last boot record

This is specially for upgrades from pre-xenopsd XenServers.

Signed-off-by: Rob Hoes <rob.hoes@citrix.com>
Comment out vbd-backend-kind example in config

Signed-off-by: Si Beaumont <simon.beaumont@citrix.com>
Merge pull request #59 from simonjbeaumont/enable-blktap3

Comment out vbd-backend-kind example in config
Merge pull request #58 from robhoes/master

CA-128803: do not take timeoffset from last boot record