Rename qa directory to test

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+The [pull-tester](/test/pull-tester/) folder contains a script to call
+multiple tests from the [rpc-tests](/test/rpc-tests/) folder.
+
+Every pull request to the bitcoin repository is built and run through
+the regression test suite. You can also run all or only individual
+tests locally.
+
+Test dependencies
+=================
+Before running the tests, the following must be installed.
+
+Unix
+----
+The python3-zmq library is required. On Ubuntu or Debian it can be installed via:
+```
+sudo apt-get install python3-zmq
+```
+
+OS X
+------
+```
+pip3 install pyzmq
+```
+
+Running tests
+=============
+
+You can run any single test by calling
+
+    test/pull-tester/rpc-tests.py <testname>
+
+Or you can run any combination of tests by calling
+
+    test/pull-tester/rpc-tests.py <testname1> <testname2> <testname3> ...
+
+Run the regression test suite with
+
+    test/pull-tester/rpc-tests.py
+
+Run all possible tests with
+
+    test/pull-tester/rpc-tests.py --extended
+
+By default, tests will be run in parallel. To specify how many jobs to run,
+append `--jobs=n` (default n=4).
+
+If you want to create a basic coverage report for the RPC test suite, append `--coverage`.
+
+Possible options, which apply to each individual test run:
+
+```
+  -h, --help            show this help message and exit
+  --nocleanup           Leave bitcoinds and test.* datadir on exit or error
+  --noshutdown          Don't stop bitcoinds after the test execution
+  --srcdir=SRCDIR       Source directory containing bitcoind/bitcoin-cli
+                        (default: ../../src)
+  --tmpdir=TMPDIR       Root directory for datadirs
+  --tracerpc            Print out all RPC calls as they are made
+  --coveragedir=COVERAGEDIR
+                        Write tested RPC commands into this directory
+```
+
+If you set the environment variable `PYTHON_DEBUG=1` you will get some debug
+output (example: `PYTHON_DEBUG=1 test/pull-tester/rpc-tests.py wallet`).
+
+A 200-block -regtest blockchain and wallets for four nodes
+is created the first time a regression test is run and
+is stored in the cache/ directory. Each node has 25 mature
+blocks (25*50=1250 BTC) in its wallet.
+
+After the first run, the cache/ blockchain and wallets are
+copied into a temporary directory and used as the initial
+test state.
+
+If you get into a bad state, you should be able
+to recover with:
+
+```bash
+rm -rf cache
+killall bitcoind
+```
+
+Writing tests
+=============
+You are encouraged to write tests for new or existing features.
+Further information about the test framework and individual RPC
+tests is found in [test/rpc-tests](/test/rpc-tests).