FEATURE: graceful shutdown for power off and reboot
Attach premigration ISCSI
FEATURE: make existing Essex volume/snapshots available in Folsom

* major change is in _lookup_lun_for_volume method. If the volume
  of snapshot was not found by its UUID name then he will try the
  lookup by EC2 name. Works both for volumes and snapshots
* self.discovered_luns contains all LUNs (volumes and snapshots)
  I use it now to lookup snapshots, where before, only volumess
  were looked-up in that dictionary
* create_snapshot now has to add newly created snapshot into
  discovered_luns with DFM LUN refresh. This slows down
  create_snapshot considerably for all snapshots
  (even Folsom-Folsom case)
* delete and create_volume_from_snapshot now lookup by snapshot
  instead of parent volume. LUN path from lookup is used directly
  instead of constructing path from volume/qtree/snapname..
Fix describe instance attribute api call.
Add simple sleep for bdm
Setup pae for kvm and i686 instances
Return default flagfile into utils from Essex
FIX: switch back to SNAT rule to any target if

without this hack, instance cannot access itself by the public IP

with "if device"
  124 17334 SNAT       all  --  *      bond0.279  172.30.48.33         0.0.0.0/0           to:166.78.83.223
without
 3355  212K SNAT       all  --  *      *       172.30.48.33         0.0.0.0/0           to:166.78.83.223
FIX: PCI-640 - trim firewall log for verbose level
Be able to remove volumes created in essex
Enforce mkfs at lvm ephemerals
FEATURE: PCI-1069 EC2 API authorization
FEATURE: PCI-1466 Hugepages memory backend for libvirt driver
FEATURE: PCI-1523 Report free LVM volume group space instead of filesystem space when LVM AMI is used.
FEATURE: PCI-1523 Report free HugeMemory space instead of free memory when hugepages are used.