python: update after recent client changes
python: update after recent client changes

No longer needs to wrap gscoped_ptr and scoped_refptr. Now we have
to do some of our own memory management.

Tested manually locally, including HEAPCHECK with the following incantation:
  LD_PRELOAD=/home/todd/git/kudu/thirdparty/installed/lib/libtcmalloc.so \
    HEAPCHECK=normal \
    python kudu/tests/test_kudu.py

Change-Id: If35a622859807617902699dec423f76ebeba6677
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/6889
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>
Tested-by: jenkins

InspurUSA/kudu,helifu/kudu,helifu/kudu,EvilMcJerkface/kudu,helifu/kudu,andrwng/kudu,helifu/kudu,helifu/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,helifu/kudu,InspurUSA/kudu,cloudera/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,andrwng/kudu,InspurUSA/kudu,andrwng/kudu,InspurUSA/kudu,cloudera/kudu,EvilMcJerkface/kudu,cloudera/kudu,EvilMcJerkface/kudu,cloudera/kudu,cloudera/kudu,InspurUSA/kudu,helifu/kudu,EvilMcJerkface/kudu,andrwng/kudu,EvilMcJerkface/kudu,andrwng/kudu,InspurUSA/kudu,cloudera/kudu,helifu/kudu,andrwng/kudu,andrwng/kudu,cloudera/kudu,EvilMcJerkface/kudu,andrwng/kudu,EvilMcJerkface/kudu,andrwng/kudu,cloudera/kudu,cloudera/kudu,helifu/kudu,InspurUSA/kudu