Merge #13049: [0.16] qa: Backports

41c29f6d1d qa: Fix python TypeError in script.py (MarcoFalke)
7460945e0b [qa] Delete cookie file before starting node (Suhas Daftuar)
0a76ed232a qa: Cache only chain and wallet for regtest datadir (MarcoFalke)
6c26df06ad [qa] Ensure bitcoind processes are cleaned up when tests end (Suhas Daftuar)
df38b130d9 [tests] Test starting bitcoind with -h and -version (John Newbery)
4bdb0ce517 [tests] Fix intermittent rpc_net.py failure. (John Newbery)
0e98f96e42 test: Use wait_until in tests where time was used for polling (Ben Woosley)
1286f3e49a test: Use wait_until to ensure ping goes out (Ben Woosley)
cfebd400ef [test] Round target fee to 8 decimals in assert_fee_amount (Karl-Johan Alm)

Pull request description:

  Similar to #12967 this contains all relevant bugfixes and improvements to the functional test suite.

  I didn't include fixes to make the tests run on Windows, since that is still an ongoing effort and doesn't seem worth to backport.

  As all of these are clean cherry-picks, I suggest reviewers redo the cherry-picks to get the same branch and then run the extended test suite.

Tree-SHA512: 70e1bc28d5572f93796f1ac4d97d77e8146869c15dcc1e3b65a730fa2641283050f769cefd9791d800c758e0a92f11fd55ed0797ccec87b897c7e701d0187f34

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