MB-7086: Add bin directory to python path
MB-7086: Add bin directory to python path

Since cbworkloadgen depends on cbtransfer, which in turn depends on
couchstore and related dlls, it is needed to add bin directory to python
path in case cbworkloadgen is moved to a different directory.

Change-Id: Id7fac8c07542ba5a0c2b2d5af9130b0a68f9c7a2
Reviewed-on: http://review.couchbase.org/22272
Tested-by: Bin Cui <ed18693fff32c00e22495f4877a3b901bed09041@gmail.com>
Reviewed-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>
Reviewed-by: Pavel Paulau <dd88eded64e90046a680e3a6c0828ceb8fe8a0e7@gmail.com>
Tested-by: Steve Yen <ef850f73f7832052d3c6d9b5ddd3a1716d9a57f1@gmail.com>

couchbaselabs/couchbase-cli,membase/membase-cli,membase/membase-cli,couchbase/couchbase-cli,membase/membase-cli,couchbase/couchbase-cli,couchbaselabs/couchbase-cli,couchbaselabs/couchbase-cli