[Bug 1219658] [NEW] Wrong image size using rbd backend for libvirt

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[Impact]

  * [2cebfd2] libvirt: convert cpu features attribute from list to 
                       a set (LP: #1267191)
  	
	cpu features list which is being sent to libvirt,
	when creating a domain or calling compareCPU, must contain only
	unique entries. Multiple issues arise when we are updating the
	features attribute in LibvirtConfigCPU class (for example during
	migration).
	
  * [b86a0e5] Fixes rdb backend image size (LP: #1219658) -> THIS!

	The original fix for bug 1219658 introduced a factor of 1024 error
	in the resulting rbd image size -> real urgent to be fixed.

[Test Case]

 * To be provided soon. 
   Tests indicate fix is running in a big production without any problem.

[Regression Potential]

 * To be provided soon.

[Other Info]

For rbd image backend for libvirt, the root partition will use the image
size not 'disk' size. It lack of resize root volume in the codes.

** Affects: nova (Ubuntu)
     Importance: Undecided
     Assignee: Haomai Wang (haomai)
         Status: In Progress

** Affects: nova/havana
     Importance: Undecided
         Status: In Progress


** Tags: havana-backport-potential libvirt
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Wrong image size using rbd backend for libvirt
https://bugs.launchpad.net/bugs/1219658
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