Add src/wallet/* code to wallet:: namespace

src/wallet/test/init_tests.cpp

@@ -10,6 +10,7 @@
 #include <util/system.h>
 #include <wallet/test/init_test_fixture.h>
 
+namespace wallet {
 BOOST_FIXTURE_TEST_SUITE(init_tests, InitWalletDirTestingSetup)
 
 BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_default)
@@ -83,3 +84,4 @@ BOOST_AUTO_TEST_CASE(walletinit_verify_walletdir_no_trailing2)
 }
 
 BOOST_AUTO_TEST_SUITE_END()
+} // namespace wallet