Make sdk tests more realistic

The tests use <sdk>_<module>_<version> as the format for a versioned
sdk member name but the format should be <sdk>_<module>@<version>. This
change corrects it and also fixes a similar issue in an error message.

Bug: 181569894
Test: m nothing
Change-Id: I8be0db4bcd0b6f4d6fbdf9e402ef7257fae8e18b