CBQE-0: resolve all conflicts due to couchbase name clash for python sdk

python sdk has a package name couchbase and so does testrunner's lib/couchbase.

This causes a conflict during import when using python sdk as we end up using testrunner's couchbase.

We cannot change python sdk naming, meanwhile testrunner's couchbase name can be changed. This fix resolves this conflict

Change-Id: I15409f6e52b3f4f09c8e6eb57f19994bfaaf65a0
Reviewed-on: http://review.couchbase.org/43619
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Parag Agarwal <agarwal.parag@gmail.com>
Tested-by: Parag Agarwal <agarwal.parag@gmail.com>