Switch docker base image from buster-scm to focal-scm (#5287)

- Switch docker base image from`buster-scm` to `focal-scm`
- Add `dockerfile` lines to correct `/etc/rsyslog.conf` settings

Fixes #5295

docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 services:
     boulder:
         # To minimize fetching this should be the same version used below
-        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.15.7}:2021-01-19
+        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.15.7}:2021-02-17
         environment:
             - FAKE_DNS=10.77.77.77
             - BOULDER_CONFIG_DIR=test/config
@@ -76,7 +76,7 @@ services:
         logging:
             driver: none
     netaccess:
-        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.15.7}:2021-01-19
+        image: letsencrypt/boulder-tools-go${TRAVIS_GO_VERSION:-1.15.7}:2021-02-17
         environment:
             GO111MODULE: "on"
             GOFLAGS: "-mod=vendor"

test/boulder-tools/Dockerfile

@@ -1,4 +1,4 @@
-FROM buildpack-deps:buster-scm
+FROM buildpack-deps:focal-scm
 ARG GO_VERSION
 
 # Copied from https://github.com/docker-library/golang/blob/master/Dockerfile-debian.template
@@ -12,3 +12,5 @@ COPY requirements.txt /tmp/requirements.txt
 COPY boulder.rsyslog.conf /etc/rsyslog.d/
 COPY build.sh /tmp/build.sh
 RUN /tmp/build.sh
+RUN sed -i '/$ActionFileDefaultTemplate/s/^/#/' /etc/rsyslog.conf
+RUN sed -i '/imklog/s/^/#/' /etc/rsyslog.conf