DISPATCH-56:: Fixes to qdmanage and python module installer

- Fix typo in qdmanage, get-* commands were calling 'create' instead of the get-* operation.
- Fix python installer to include output files in cmake install_manifest.txt for uninstall scripts.

git-svn-id: https://svn.apache.org/repos/asf/qpid/dispatch/trunk@1625329 13f79535-47bb-0310-9956-ffa450edef68