Fix resize volume stuck in "RESIZE" status

While resizing a improper volume, it may stuck in "RESIZE" status and Trove
can't deal with this status with other actions. We need to catch the exception.

Now, resize volume method exists some problems to achieve the goal. This patch
will solve the critical problem firstly.

fix bug 1212767
Change-Id: I868694fc01217ef0e6e8450ce981c4cab544b612
Merge "Fix resize volume stuck in "RESIZE" status"
Add instance cloudinit support

implements blueprint guestagent-through-userdata

Change-Id: Ifb33f149e63d7b9b7ed676da8ff05085ceceffeb
Merge branch 'master' of https://github.com/openstack/trove