bug 1467518: Use random hashes in Python 3.6 build
bug 1467518: Use random hashes in Python 3.6 build

Code that depends on a fixed dictionary hash was removed in PR 4851.
This removes it from the optional Python build, and removes the seed/no
seed branch from the test script.

mozilla/kuma,Elchi3/kuma,mozilla/kuma,a2sheppy/kuma,escattone/kuma,Elchi3/kuma,mozilla/kuma,SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,jwhitlock/kuma,SphinxKnight/kuma,jwhitlock/kuma,SphinxKnight/kuma,jwhitlock/kuma,SphinxKnight/kuma,a2sheppy/kuma,mozilla/kuma,Elchi3/kuma,a2sheppy/kuma,escattone/kuma,mozilla/kuma,escattone/kuma,jwhitlock/kuma,a2sheppy/kuma,SphinxKnight/kuma,a2sheppy/kuma,jwhitlock/kuma