auparse_find_field - search for field name
const char *auparse_find_field(auparse_state_t *au, const char
auparse_find_field will scan all records in an event to find the first
occurrence of the field name passed to it. Searching begins from the cursor's
current position. The field name is stored for subsequent searching.
Returns NULL field not found. If an error occurs errno will be set. Otherwise,
it returns a pointer to the text value associated with the field.