Unit tests we should have for el_utils

The positive tests:
   - Create a new EL via oh_el_create (001)
      - examine EL struct
   - Create a new EL, add 1 entry (002)
      - examine total number of entries in struct. Should be 1.
      - Compare entry in EL with entry used for adding to EL.
   - Create a new EL, add 5 entries (003)
      - examine total number of entries in struct. Should be 5.
      - Compare entries in EL with entries used for adding to EL.
   - Create a new EL, add 5 entries. Save EL to file (004)
      - Restore saved EL to another new EL struct.
      - Compare number of entries between the two logs.
   - Create a new EL, add 10 entries. Save EL to file (005)
      - Restore saved EL to another new EL struct.
      - Compare entries between the two logs.
   - Create a new EL, add 5 entries. Save EL to file (006)
      - Restore saved EL to another new EL struct.
      - Add 5 entries to first and second EL.
      - Check number of entries (Should be 10)
      - Compare entries with original ones.
   - Create a new El with a modified timestamp offset (007)
      - add 1 new entry, examine timestamp.
   - Create a new EL, add 5 entries. Clear the EL (008)
      - Examine EL to make sure that there are no entries.


The negative tests:
   oh_el_close (009)
      -  el == NULL
   oh_el_append (010)
      - el == NULL
      - event == NULL
      - el->enabled == SAHPI_FALSE &&
        event->EventType == SAHPI_ET_USER
   oh_el_prepend (011)
      - el == NULL
      - event == NULL
      - el->enabled == SAHPI_FALSE
   oh_el_clear (012)
      -  el == NULL
   oh_el_get (013)
      - el == NULL
      - entryId == bogus entryId
      - prev == NULL
      - next == NULL
      - empty EL
   oh_el_info (014)
      - el == NULL
      - info == NULL
   oh_el_overflowreset (015)
      - el == NULL
   oh_el_map_to_file (016)
      - el == NULL
      - filename == NULL
   oh_el_map_from_file (017)
      - el == NULL
      - el->enabled == SAHPI_FALSE
      - filename == NULL
      - filename does not exist
   oh_el_timeset (018)
      - el == NULL
      - timestamp == SAHPI_TIME_UNSPECIFIED
   oh_el_setgentimestampflag (019)
      - el == NULL

