tests: add a BasicTestingSetup and apply to all tests

Make sure that chainparams and logging is properly initialized. Doing
this for every test may be overkill, but this initialization is so
simple that that does not matter.

This should fix the travis issues.

src/test/multisig_tests.cpp

@@ -10,6 +10,7 @@
 #include "script/interpreter.h"
 #include "script/sign.h"
 #include "uint256.h"
+#include "test/test_bitcoin.h"
 
 #ifdef ENABLE_WALLET
 #include "wallet_ismine.h"
@@ -22,7 +23,7 @@ using namespace std;
 
 typedef vector<unsigned char> valtype;
 
-BOOST_AUTO_TEST_SUITE(multisig_tests)
+BOOST_FIXTURE_TEST_SUITE(multisig_tests, BasicTestingSetup)
 
 CScript
 sign_multisig(CScript scriptPubKey, vector<CKey> keys, CTransaction transaction, int whichIn)