Make Synapse not log to text files

Somewhat related to #213 (Github Pull Request).

We've been moving in the opposite direction for quite a long time.
All services should just leave logging to systemd's journald.

roles/matrix-synapse/defaults/main.yml

@@ -69,8 +69,6 @@ matrix_synapse_form_secret: "{{ matrix_synapse_macaroon_secret_key }}"
 matrix_synapse_trusted_third_party_id_servers: "{{ matrix_synapse_id_servers_public }}"
 
 matrix_synapse_max_upload_size_mb: 10
-matrix_synapse_max_log_file_size_mb: 100
-matrix_synapse_max_log_files_count: 10
 
 # The tmpfs at /tmp needs to be large enough to handle multiple concurrent file uploads.
 matrix_synapse_tmp_directory_size_mb: "{{ matrix_synapse_max_upload_size_mb * 50 }}"

roles/matrix-synapse/templates/synapse/synapse.log.config.j2

@@ -4,7 +4,7 @@ version: 1
 
 formatters:
     precise:
-        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s - %(message)s'
+        format: '%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(request)s- %(message)s'
 
 filters:
     context:
@@ -12,14 +12,6 @@ filters:
         request: ""
 
 handlers:
-    file:
-        class: logging.handlers.RotatingFileHandler
-        formatter: precise
-        filename: /matrix-run/homeserver.log
-        maxBytes: {{ matrix_synapse_max_log_file_size_mb * 1024 * 1024 }}
-        backupCount: {{ matrix_synapse_max_log_files_count }}
-        filters: [context]
-        encoding: utf8
     console:
         class: logging.StreamHandler
         formatter: precise
@@ -41,4 +33,4 @@ loggers:
 
 root:
     level: {{ matrix_synapse_root_log_level }}
-    handlers: [file, console]
+    handlers: [console]