add read function to IO

  -Fix Illegal seek bug
  -https://bugs.launchpad.net/fuel/+bug/1250776
add [1].read to popen3
Check corosync property for empty XML root

Fixes sporadic bugs on HA installations where cs_property
resource is not created after the first attempt.
Merge pull request #907 from Mirantis/pick-corosync-fixes

Pick corosync fixes