Merge pull request #6813

d80e3cb Support gathering of code coverage data for RPC tests (dexX7)
e3b5e6c Run extended BitcoinJ tests for coverage based on config (dexX7)
45d4ff0 Add config option to enable extended RPC tests for code coverage (dexX7)
8e3a27b Require Python for RPC tests, when using lcov (dexX7)
d425877 Remove coverage and test related files, when cleaning up (dexX7)
4d2a926 Ignore coverage data related and temporary test files (dexX7)