test_bitcoin: Avoid read/write to default datadir

src/test/net_tests.cpp

@@ -89,6 +89,7 @@ BOOST_AUTO_TEST_CASE(cnode_listen_port)
 
 BOOST_AUTO_TEST_CASE(caddrdb_read)
 {
+    SetDataDir("caddrdb_read");
     CAddrManUncorrupted addrmanUncorrupted;
     addrmanUncorrupted.MakeDeterministic();
 
@@ -134,6 +135,7 @@ BOOST_AUTO_TEST_CASE(caddrdb_read)
 
 BOOST_AUTO_TEST_CASE(caddrdb_read_corrupted)
 {
+    SetDataDir("caddrdb_read_corrupted");
     CAddrManCorrupted addrmanCorrupted;
     addrmanCorrupted.MakeDeterministic();