face7220b7 qa: Move common args to bitcoin.conf (MarcoFalke)
Pull request description:
Beside removing duplicates of the same args in the code, this actually helps with debugging after a test failure.
For example, `bitcoin-qt` has `server` turned off, so you'd have to turn it on every time, if you wanted to debug a temporary test datadir created by the test framework.
Also, `keypool` would fill up if you forget to specify `-keypool=1`.
Tree-SHA512: 996bec8738dc0fce7297ab1fc5b4fbe3aa31b9b6241f8c4e685db728925363ccaca6145ad1edc6bee2f360e02ac4b9a53fcdff74eb79de90793393742d52b559