There's a big difference in the base classes of _MemcacheClient that are
resolved at run-time when comparing Junien's testcase in comment #1 vs
the code being executed via nova-api-os-compute in the failure case.
Also showing arguments here for the failing case since I have them
handy:

Successful testcase:
--------------------
CCB inspect.getmro(_MemcacheClient)=(<class 
'oslo_cache._memcache_pool._MemcacheClient'>, <class 'memcache.Client'>, <class 
'_thread._local'>, <class 'object'>)
<oslo_cache._memcache_pool._MemcacheClient object at 0x7f984ddd04c8>

Failure via nova-api-os-compute:
--------------------------------
self._arguments={'dead_retry': 300, 'socket_timeout': 3.0}
self.urls=['10.5.0.117:11211']
inspect.getmro(_MemcacheClient)=(<class 
'oslo_cache._memcache_pool._MemcacheClient'>, <class 'memcache.Client'>, <class 
'eventlet.corolocal.local'>, <class 'eventlet.corolocal._localbase'>, <class 
'object'>)

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https://bugs.launchpad.net/bugs/1812672

Title:
  impossible to create nova instances after upgrading to rocky

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