Handle ADIOS missing features correctly

There are some functions where the logging seems to indicate that ADIOS support is not available. However these functions silently succeed (instead of returning a NOT_IMPL kind of error the user gets a PIO_NOERR). We need to investigate these further and handle the conditions correctly.

For e.g. the newly added tests to query unavailable attributes, in ncdf_fail, succeed with ADIOS (while the fail, as expected, with other iotypes).

Note: @dqwu tried returning errors for all cases where the logging suggested ADIOS implementation was missing, however that resulted in many failures in the Scorpio test suite.