[PATCH] Xend: Refactor VMMetrics Destruction

[PATCH] Xend: Refactor VMMetrics Destruction

[Yosuke Iwamatsu]

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This is a clean up patch about the destruction of xen-api instances.

Xen-api classes based on XendBase class have their instances stored in
XendAPIStore. Instances which belong to a domain (such as vmmeetrics and
dpci) should be remove from XendAPIStore when the domain is destroyed.

I looked into domain destruction code path in xend and it seemed the
destruction was essentially done in XendDomain.py by deleting domains
from the domain list like:
  del self.domains[domid] (for normall domains)
  del self.managed_domains[dom.get_uuid()] (for managed domains)
This patch simply invokes destroy_xapi_instances() right after these
lines to assure theese instances will be removed at the same time as the
domain's disappearance.

Regards,
-----------------------
Yosuke Iwamatsu
        NEC Corporation

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