house: change variable names in test (#648)
house: change variable names in test (#648)

This prefixes the simple names verse and song with "expected" thus freeing up
the more obvious names to be used in the solution without causing the error that
the names are already used in the test suite.
leenipper/xgo,robphoenix/exercism-go,exercism/xgo,robphoenix/exercism-go,exercism/xgo,leenipper/xgo