build: install libnet-dev

It will be used to generate tcp packets for restoring half-closed sockets.

travis-ci: success for series starting with [01/21] build: install libnet-dev
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

scripts/build/Dockerfile.alpine

@@ -11,6 +11,7 @@ RUN apk update && apk add \
                 libcap-dev \
                 libnl3-dev \
                 pkgconfig \
+                libnet-dev \
                 $CC
 COPY . /criu
 WORKDIR /criu

scripts/build/Dockerfile.tmpl

@@ -15,6 +15,7 @@ RUN apt-get update && apt-get install -y \
                 libselinux-dev \
                 pkg-config \
                 git-core \
+		libnet-dev \
                 $CC
 
 COPY . /criu

scripts/travis/travis-tests

@@ -3,7 +3,7 @@ set -x -e
 
 TRAVIS_PKGS="protobuf-c-compiler libprotobuf-c0-dev libaio-dev
 		libprotobuf-dev protobuf-compiler python-ipaddr libcap-dev
-		libnl-3-dev gdb bash python-protobuf"
+		libnl-3-dev gdb bash python-protobuf libnet-dev"
 
 travis_prep () {
 	[ -n "$SKIP_TRAVIS_PREP" ] && return