contrib: add mako requirement to docker files.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

contrib/Dockerfile.builder

@@ -29,6 +29,7 @@ RUN apt-get -qq update && \
 	python3 \
 	valgrind \
 	net-tools \
+	python3-mako \
 	python3-pip \
 	python3-setuptools \
 	python-pkg-resources \
@@ -66,4 +67,4 @@ RUN pip3 install --upgrade pip && \
 	tqdm==4.26.0 \
 	pytest-test-groups==1.0.3 \
 	flake8==3.5.0 \
-	pytest-rerunfailures==3.1
+	pytest-rerunfailures==3.1

contrib/Dockerfile.builder.fedora

@@ -13,6 +13,7 @@ RUN dnf update -y && \
 		libsq3-devel \
 		python2-devel \
 		python3-devel \
+		python3-mako \
 		python3-pip \
 		python3-setuptools \
 		redhat-lsb \

contrib/Dockerfile.builder.i386

@@ -29,6 +29,7 @@ RUN apt-get -qq update && \
 	python3 \
 	valgrind \
 	net-tools \
+	python3-mako \
 	python3-pip \
 	python3-setuptools \
 	python-pkg-resources \