Completely remove status reports and date functions

Remove Status Reports:
- show-expire: Shows expration status
- show-revoke: Shows revoked status
- show-renew: Shows renew status

Removed Unused functions:
- ssl_cert_not_before_date()
- ssl_cert_not_after_date()
- iso_8601_cert_startdate()
- iso_8601_cert_enddate()
- iso_8601_timestamp_to_seconds()
- days_to_timestamp_s()
- cert_date_to_timestamp_s()
- db_date_to_iso_8601_date()
- cert_date_to_iso_8601_date()
- read_db()

Signed-off-by: Richard T Bonhomme <[email protected]>