Support gathering of code coverage data for RPC tests

The RPC tests (via `qa/pull-tester/rpc-tests.py`) are now executed,
when gathering code coverage data, for example with `make cov`.

Generating coverage data requires `lcov`, which can installed with:

    sudo apt-get install lcov

To also use the BitcoinJ tests, get the test tool:

    TOOL_URL=https://github.com/theuni/bitcoind-comparisontool/raw/master/pull-tests-8c6666f.jar
    TOOL_HASH=a865332b3827abcde684ab79f5f43c083b0b6a4c97ff5508c79f29fee24f11cd
    wget $TOOL_URL -O ./share/BitcoindComparisonTool.jar
    echo "$TOOL_HASH  ./share/BitcoindComparisonTool.jar" | shasum --algorithm 256 --check

The coverage data can be generated with:

    ./autogen.sh
    ./configure --enable-lcov --with-comparison-tool=./share/BitcoindComparisonTool.jar
    make
    make cov

Optionally the options `--enable-extended-rpc-tests` and
`--enable-comparison-tool-reorg-tests` may be used to enable more time
consuming tests.

It then runs the tests and generates two HTML reports:

 - test_bitcoin.coverage/index.html
 - total.coverage/index.html

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