hapi interface needs an option to return, rather than print, catalogs

[jameswilburlewis]

When fetching a large catalog via hapi() (e.g. cdaweb), there can be hundreds or thousands of datasets returned. Printing pages and pages of datasets isn't going to be very useful in an interactive session. It would be better to have the option of returning, rather than printing, the catalog. As it stands now, the catalog output is blowing up the size of our test logs

Also, if we are printing the output, we probably want plain prints rather than logging calls.