Dockerfile.*: drop libbtrfs

This is no longer necessary after the switch to the kernel UAPI.

Signed-off-by: Bjorn Neergaard <bneergaard@mirantis.com>

Dockerfile

@@ -535,7 +535,6 @@ RUN --mount=type=cache,sharing=locked,id=moby-dev-aptlib,target=/var/lib/apt \
             pkg-config \
             dpkg-dev \
             libapparmor-dev \
-            libbtrfs-dev \
             libdevmapper-dev \
             libseccomp-dev \
             libsecret-1-dev \
@@ -554,7 +553,6 @@ RUN --mount=type=cache,sharing=locked,id=moby-build-aptlib,target=/var/lib/apt \
         xx-apt-get install --no-install-recommends -y \
             gcc \
             libapparmor-dev \
-            libbtrfs-dev \
             libc6-dev \
             libdevmapper-dev \
             libseccomp-dev \

Dockerfile.e2e

@@ -4,7 +4,6 @@ FROM golang:${GO_VERSION}-alpine AS base
 ENV GO111MODULE=off
 RUN apk --no-cache add \
     bash \
-    btrfs-progs-dev \
     build-base \
     curl \
     lvm2-dev \

Dockerfile.simple

@@ -24,10 +24,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 		build-essential \
 		curl \
 		cmake \
-		gcc \
 		git \
 		libapparmor-dev \
-		libbtrfs-dev \
 		libdevmapper-dev \
 		libseccomp-dev \
 		ca-certificates \