remove python-future dependency

This commit removes the dependency on the __future__ module, which was
used to enable Python 3 features in Python 2 code. With support for
Python 2 being dropped, it is no longer necessary to maintain backward
compatibility.

Signed-off-by: Radostin Stoyanov <rstoyanov@fedoraproject.org>

scripts/build/Dockerfile.amd-rocm

@@ -55,7 +55,6 @@ RUN apt-get clean -qqy && apt-get update -qqy && apt-get install -qqy --no-insta
 	protobuf-compiler \
 	python-protobuf \
 	python3-minimal \
-	python3-future \
 	python-ipaddress \
 	curl \
 	wget \

scripts/build/Dockerfile.centos8

@@ -28,7 +28,6 @@ RUN yum install -y --allowerasing \
 	python3-devel \
 	python3-flake8 \
 	python3-PyYAML \
-	python3-future \
 	python3-protobuf \
 	python3-pip \
 	sudo \

scripts/build/Dockerfile.hotspot-ubuntu

@@ -6,7 +6,6 @@ COPY scripts/ci/apt-install /bin/apt-install
 RUN apt-install protobuf-c-compiler \
 	libprotobuf-c-dev \
 	libaio-dev \
-	python3-future \
 	libprotobuf-dev \
 	protobuf-compiler \
 	libcap-dev \
@@ -31,4 +30,3 @@ WORKDIR /criu
 RUN make mrproper && make -j $(nproc) CC="$CC"
 
 ENTRYPOINT mvn -q -f test/javaTests/pom.xml test
-

scripts/build/Dockerfile.linux32.tmpl

@@ -21,8 +21,7 @@ RUN apt-install \
 	pkg-config \
 	protobuf-c-compiler \
 	protobuf-compiler \
-	python3-minimal \
-	python3-future
+	python3-minimal
 
 COPY . /criu
 WORKDIR /criu

scripts/build/Dockerfile.openj9-ubuntu

@@ -6,7 +6,6 @@ COPY scripts/ci/apt-install /bin/apt-install
 RUN apt-install protobuf-c-compiler \
 	libprotobuf-c-dev \
 	libaio-dev \
-	python3-future \
 	libprotobuf-dev \
 	protobuf-compiler \
 	libcap-dev \

scripts/build/Dockerfile.tmpl

@@ -30,8 +30,7 @@ RUN apt-install \
 	python-is-python3 \
 	python3-minimal \
 	python3-protobuf \
-	python3-yaml \
-	python3-future
+	python3-yaml
 
 COPY . /criu
 WORKDIR /criu