Added test for new function getAptSuffix()

EV-545

Added the new function getAppointmentTypeSuffix() and added
a test for the new function. Also changed the contstructor to
pass in the suffix.
Updated function comment and removed unnecessary imports

EV-545
Merge pull request #78 from osu-mist/feature/EV-545-add-pdf-prof-faculty-suffix

Added test for new function getAptSuffix()