Initialization: setup environment before starting tests

The environment is prepared by the main thread to guard against invalid locale settings and to prevent deinitialization issues of Boost path, which can result in app crashes.

src/test/test_bitcoin.cpp

@@ -30,6 +30,7 @@ struct TestingSetup {
     boost::thread_group threadGroup;
 
     TestingSetup() {
+        SetupEnvironment();
         fPrintToDebugLog = false; // don't want to write to debug.log file
         fCheckBlockIndex = true;
         SelectParams(CBaseChainParams::UNITTEST);