Make compute rpcapi 'live_migration' backward compatible
This commit[1] added compute rpcapi version 4.2 which introduced a new argument 'migration' when calling 'live_migration' method, but the code did not ensure the backward compatibility with older version compute node. When calling 'live_migration' method with 'migration' argument on older version(like Kilo) of nova compute node, a "TypeError: live_migration() got an unexpected keyword argument 'migration'" will be threw up. [1]2f4e64a7cf
Change-Id: Ie5c498d34e7c4c6573d611abd592c25f1bcb4f44 Closes-Bug: #1576048 (cherry picked from commit34b8336a41
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@ -547,6 +547,7 @@ class ComputeAPI(object):
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version = '4.2'
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if not self.client.can_send_version(version):
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version = '4.0'
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args.pop('migration')
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cctxt = self.client.prepare(server=host, version=version)
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cctxt.cast(ctxt, 'live_migration', instance=instance,
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dest=dest, block_migration=block_migration,
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