Fix breakage when distribute is not installed
Fix breakage when distribute is not installed

This fixes a typo in the fallback code, and also allows us to set an
environment variable so the fallback code can be triggered (For testing
purposes)

Change-Id: I5e12b188aa130a5bf71dbdf00b4862eef9115d9f
Reviewed-on: http://review.couchbase.org/27070
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: Mordechai Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

couchbase/couchbase-python-client,mnunberg/couchbase-python-client,mnunberg/couchbase-python-client,couchbase/couchbase-python-client