caddy-frontend: Fix http2 enable/disable implementation

Transmit default setting to each slave, as there the decision
about serving or not HTTP2 happens.

As Caddy might always serve HTTP2 sites force it to always being able to
serve such sites using HTTP2.

Then per site check what is the default, and enable/disable HTTP2.

software/caddy-frontend/buildout.hash.cfg

@@ -19,7 +19,7 @@ md5sum = f686f765e55d1dce2e55a400f0714b3e
 
 [template-apache-frontend]
 filename = instance-apache-frontend.cfg
-md5sum = 6a2a0ada0bf281a725712b9c29a12b34
+md5sum = 441ebd011cd33f17b48590cc6969970a
 
 [template-apache-replicate]
 filename = instance-apache-replicate.cfg.in
@@ -27,7 +27,7 @@ md5sum = 9e76028df7e93d3e32982884d5dc0913
 
 [template-slave-list]
 filename = templates/apache-custom-slave-list.cfg.in
-md5sum = 3e7350f9f27cddc63ee9711b548790fa
+md5sum = 1867c268830af61bcc245d0c88b634fb
 
 [template-slave-configuration]
 filename = templates/custom-virtualhost.conf.in
@@ -43,7 +43,7 @@ md5sum = edfdd21d712f4ba4c2e1fcb9ea096554
 
 [template-custom-slave-list]
 filename = templates/apache-custom-slave-list.cfg.in
-md5sum = 3e7350f9f27cddc63ee9711b548790fa
+md5sum = 1867c268830af61bcc245d0c88b634fb
 
 [template-not-found-html]
 filename = templates/notfound.html
@@ -55,7 +55,7 @@ md5sum = 88a31d5a26c26408443fa5c2550ff8ac
 
 [template-default-slave-virtualhost]
 filename = templates/default-virtualhost.conf.in
-md5sum = 831d2eb5a0489b340dcf244025e579b0
+md5sum = bb80ef5a195b841a071c7104544ae776
 
 [template-cached-slave-virtualhost]
 filename = templates/cached-virtualhost.conf.in
@@ -75,7 +75,7 @@ md5sum = 8cde04bfd0c0e9bd56744b988275cfd8
 
 [template-caddy-wrapper]
 filename = templates/caddy-wrapper.in
-md5sum = 30921eb4be1dc867f9f6749688e6098a
+md5sum = 688d06546a12aa74ff4eea59fee624b8
 
 [template-trafficserver-records-config]
 filename = templates/trafficserver/records.config.jinja2

software/caddy-frontend/instance-apache-frontend.cfg

@@ -212,6 +212,8 @@ extra-context =
     key login_ca_crt ca-custom-frontend:rendered
     raw sixtunnel_executable ${6tunnel:location}/bin/6tunnel
     raw service_directory $${directory:service}
+    key enable_http2_by_default instance-parameter:configuration.enable-http2-by-default
+
 [dynamic-virtualhost-template-slave]
 <= jinja2-template-base
 template = ${template-slave-configuration:target}
@@ -263,7 +265,6 @@ extra-context =
     key https_port instance-parameter:configuration.port
     key content apache-configuration:frontend-graceful-command
     key log apache-configuration:error-log
-    key http2 instance-parameter:configuration.enable-http2-by-default
     key grace instance-parameter:configuration.mpm-graceful-shutdown-timeout
     key pidfile apache-configuration:pid-file
 
@@ -711,7 +712,6 @@ extra-context =
     key http_port nginx-configuration:plain_port
     key https_port nginx-configuration:port
     key log nginx-configuration:error_log
-    key http2 instance-parameter:configuration.enable-http2-by-default
     key grace instance-parameter:configuration.mpm-graceful-shutdown-timeout
     key pidfile nginx-configuration:pid-file
 

software/caddy-frontend/templates/apache-custom-slave-list.cfg.in

@@ -161,6 +161,7 @@ value = {{ dumps(slave_instance.get(cert_name)) }}
 {%-   do slave_instance.__setitem__('login_certificate', login_certificate) %}
 {%-   do slave_instance.__setitem__('login_key', login_key) %}
 {%-   do slave_instance.__setitem__('login_ca_crt', login_ca_crt) %}
+{%-   do slave_instance.__setitem__('enable_http2_by_default', enable_http2_by_default) %}
 {%-   do slave_parameter_dict.__setitem__('ssl_crt', login_certificate) %}
 {%-   do slave_parameter_dict.__setitem__('ssl_key', login_key) %}
 {%   if 'ssl_key' in slave_instance and 'ssl_crt' in slave_instance -%}

software/caddy-frontend/templates/caddy-wrapper.in

@@ -7,7 +7,7 @@ exec {{ caddy }} \
   -http-port {{ http_port }} \
   -https-port {{ https_port }} \
   -log {{ log }} \
-  -http2={{ http2 }} \
+  -http2=true \
   -grace {{ grace }}s \
   -pidfile {{ pidfile }} \
   -disable-http-challenge \

software/caddy-frontend/templates/default-virtualhost.conf.in

@@ -3,7 +3,7 @@
 {%- set disable_via_header = ('' ~ slave_parameter.get('disable-via-header', '')).lower() in TRUE_VALUES -%}
 {%- set prefer_gzip = ('' ~ slave_parameter.get('prefer-gzip-encoding-to-backend', '')).lower() in TRUE_VALUES -%}
 {%- set server_alias_list =  slave_parameter.get('server-alias', '').split() -%}
-{%- set enable_h2 = ('' ~ slave_parameter.get('enable-http2', 'true')).lower() in TRUE_VALUES -%}
+{%- set enable_h2 = ('' ~ slave_parameter.get('enable-http2', slave_parameter['enable_http2_by_default'])).lower() in TRUE_VALUES -%}
 {%- set ssl_proxy_verify = ('' ~ slave_parameter.get('ssl-proxy-verify', '')).lower() in TRUE_VALUES -%}
 {%- set disabled_cookie_list =  slave_parameter.get('disabled-cookie-list', '').split() -%}
 {%- set https_only = ('' ~ slave_parameter.get('https-only', '')).lower() in TRUE_VALUES -%}