Remove letters-related code (#175)

This deletes a big ol' chunk of code related to letters. It's not everything—there are still a few things that might be tied to sms/email—but it's the the heart of letters function. SMS and email function should be untouched by this.

Areas affected:

- Things obviously about letters
- PDF tasks, used for precompiling letters
- Virus scanning, used for those PDFs
- FTP, used to send letters to the printer
- Postage stuff

tests/app/v2/template/test_get_template.py

@@ -1,29 +1,23 @@
 import pytest
 from flask import json
 
-from app.models import EMAIL_TYPE, LETTER_TYPE, SMS_TYPE, TEMPLATE_TYPES
+from app.models import EMAIL_TYPE, SMS_TYPE, TEMPLATE_TYPES
 from app.utils import DATETIME_FORMAT
 from tests import create_service_authorization_header
-from tests.app.db import create_letter_contact, create_template
+from tests.app.db import create_template
 
 valid_version_params = [None, 1]
 
 
-@pytest.mark.parametrize("tmp_type, expected_name, expected_subject,postage", [
-    (SMS_TYPE, 'sms Template Name', None, None),
-    (EMAIL_TYPE, 'email Template Name', 'Template subject', None),
-    (LETTER_TYPE, 'letter Template Name', 'Template subject', "second")
+@pytest.mark.parametrize("tmp_type, expected_name, expected_subject", [
+    (SMS_TYPE, 'sms Template Name', None),
+    (EMAIL_TYPE, 'email Template Name', 'Template subject'),
 ])
 @pytest.mark.parametrize("version", valid_version_params)
 def test_get_template_by_id_returns_200(
-    client, sample_service, tmp_type, expected_name, expected_subject, version, postage
+    client, sample_service, tmp_type, expected_name, expected_subject, version
 ):
-    letter_contact_block_id = None
-    if tmp_type == 'letter':
-        letter_contact_block = create_letter_contact(sample_service, "Buckingham Palace, London, SW1A 1AA")
-        letter_contact_block_id = letter_contact_block.id
-
-    template = create_template(sample_service, template_type=tmp_type, contact_block_id=(letter_contact_block_id))
+    template = create_template(sample_service, template_type=tmp_type)
     auth_header = create_service_authorization_header(service_id=sample_service.id)
 
     version_path = '/version/{}'.format(version) if version else ''
@@ -47,8 +41,6 @@ def test_get_template_by_id_returns_200(
         "subject": expected_subject,
         'name': expected_name,
         'personalisation': {},
-        'postage': postage,
-        'letter_contact_block': letter_contact_block.contact_block if letter_contact_block_id else None,
     }
 
     assert json_response == expected_response
@@ -105,44 +97,6 @@ def test_get_template_by_id_returns_placeholders(
     assert json_response['personalisation'] == expected_personalisation
 
 
-@pytest.mark.parametrize("version", valid_version_params)
-def test_get_letter_template_by_id_returns_placeholders(
-    client,
-    sample_service,
-    version,
-):
-    contact_block = create_letter_contact(
-        service=sample_service,
-        contact_block='((contact block))',
-    )
-    template = create_template(
-        sample_service,
-        template_type=LETTER_TYPE,
-        subject="((letterSubject))",
-        content="((letter_content))",
-        reply_to=contact_block.id,
-    )
-    auth_header = create_service_authorization_header(service_id=sample_service.id)
-
-    version_path = '/version/{}'.format(version) if version else ''
-
-    response = client.get(path='/v2/template/{}{}'.format(template.id, version_path),
-                          headers=[('Content-Type', 'application/json'), auth_header])
-
-    json_response = json.loads(response.get_data(as_text=True))
-    assert json_response['personalisation'] == {
-        "letterSubject": {
-            "required": True,
-        },
-        "letter_content": {
-            "required": True,
-        },
-        "contact block": {
-            "required": True,
-        },
-    }
-
-
 def test_get_template_with_non_existent_template_id_returns_404(client, fake_uuid, sample_service):
     auth_header = create_service_authorization_header(service_id=sample_service.id)