Revert "Squashed 'qa/rpc-tests/python-bitcoinrpc/' content from commit e484743"

This reverts commit 260cf5c0a4754be39b05f6a247b8a354de7eced6.

Rebased-From: da0b9d4
build: fix explicit --disable-qt-dbus

It worked in the auto/yes cases, but an explicit disable actually forced
it on.

Rebased-From: a22e9a3