rb-site fails to detect memcache when installed from an egg

Review Request #843 — Created April 28, 2009 and submitted — Latest diff uploaded

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rb-site fails to detect the "memcache" module when memcache is installed as an egg.  Something about imp.find_module does not honor sys.path_hooks and doesn't use the zipimporter.  This appears to be true in 2.4, 2.5, and 2.6.
Ran "rb-site install", now properly detects memcache installation.