Remove duplicate Mapper() constructor

Change-Id: Ie65fa739dc90515a7170a49c0552b69cdbb7d044
Signed-off-by: Angus Salkeld <asalkeld@redhat.com>
Depend on recently released python-quantumclient 2.1.2
Fixes bug 1133381

Change-Id: I9e3f1185e77c8f021a523f201d2191389eb253ef
Merge "Remove duplicate Mapper() constructor"