update criu to 2.12.1

Signed-off-by: Krasi Georgiev <krasi@vip-consult.solutions>

Dockerfile

@@ -154,8 +154,10 @@ RUN git clone https://github.com/golang/lint.git /go/src/github.com/golang/lint
 	&& go install -v github.com/golang/lint/golint
 
 # Install CRIU for checkpoint/restore support
-ENV CRIU_VERSION 2.9
-RUN mkdir -p /usr/src/criu \
+ENV CRIU_VERSION 2.12.1
+# Install dependancy packages specific to criu
+RUN apt-get install libnet-dev -y && \
+	mkdir -p /usr/src/criu \
 	&& curl -sSL https://github.com/xemul/criu/archive/v${CRIU_VERSION}.tar.gz | tar -v -C /usr/src/criu/ -xz --strip-components=1 \
 	&& cd /usr/src/criu \
 	&& make \