Account for root ownership of overlay files.

Since we chown and chmod files in the overlay, we need to ensure that we
can write to them in each of the bootstrap-rootfs-overlay generation
scripts.

Eventually, I think we should make overlays as tarballs with ownership
and permissions inside the archive to avoid this dance.

Changelog: Title
Signed-off-by: Drew Moseley <drew.moseley@northern.tech>

.dockerignore

@@ -1,3 +1,4 @@
 deploy
 input
 work
+rootfs_overlay*

scripts/bootstrap-rootfs-overlay-demo-server.sh

@@ -52,6 +52,7 @@ if [ -z "${server_ip}" ]; then
   exit 1
 fi
 
+sudo chown -R $(id -u).$(id -g) ${output_dir}
 mkdir -p ${output_dir}/etc/mender
 cat <<- EOF > ${output_dir}/etc/mender/mender.conf
 {

scripts/bootstrap-rootfs-overlay-hosted-server.sh

@@ -53,6 +53,7 @@ if [ -z "${tenant_token}" ]; then
   exit 1
 fi
 
+sudo chown -R $(id -u).$(id -g) ${output_dir}
 mkdir -p ${output_dir}/etc/mender
 cat <<- EOF > ${output_dir}/etc/mender/mender.conf
 {

scripts/bootstrap-rootfs-overlay-production-server.sh

@@ -57,6 +57,7 @@ if [ -z "${server_url}" ]; then
   exit 1
 fi
 
+sudo chown -R $(id -u).$(id -g) ${output_dir}
 mkdir -p ${output_dir}/etc/mender
 cat <<- EOF > ${output_dir}/etc/mender/mender.conf
 {