Add integration test for box finalizers

tests/fixtures/finalizers/alpine/build.yaml

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+image: "alpine"
+unpack: true

tests/fixtures/finalizers/alpine/definition.yaml

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+category: "seed"
+name: "alpine"
+version: "1.0"

tests/fixtures/finalizers/alpine/finalize.yaml

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+install:
+- touch /tmp/foo

tests/integration/07_finalizer.sh

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+#!/bin/bash
+
+export LUET_NOLOCK=true
+
+oneTimeSetUp() {
+export tmpdir="$(mktemp -d)"
+}
+
+oneTimeTearDown() {
+    rm -rf "$tmpdir"
+}
+
+testBuild() {
+    mkdir $tmpdir/testbuild
+    luet build --tree "$ROOT_DIR/tests/fixtures/finalizers" --destination $tmpdir/testbuild --compression gzip --all > /dev/null
+    buildst=$?
+    assertEquals 'builds successfully' "$buildst" "0"
+    assertTrue 'create package' "[ -e '$tmpdir/testbuild/alpine-seed-1.0.package.tar.gz' ]"
+}
+
+testRepo() {
+    assertTrue 'no repository' "[ ! -e '$tmpdir/testbuild/repository.yaml' ]"
+    luet create-repo --tree "$ROOT_DIR/tests/fixtures/finalizers" \
+    --output $tmpdir/testbuild \
+    --packages $tmpdir/testbuild \
+    --name "test" \
+    --descr "Test Repo" \
+    --urls $tmpdir/testrootfs \
+    --type disk > /dev/null
+
+    createst=$?
+    assertEquals 'create repo successfully' "$createst" "0"
+    assertTrue 'create repository' "[ -e '$tmpdir/testbuild/repository.yaml' ]"
+}
+
+testConfig() {
+    mkdir $tmpdir/testrootfs
+    cat <<EOF > $tmpdir/luet.yaml
+general:
+  debug: true
+system:
+  rootfs: $tmpdir/testrootfs
+  database_path: "/"
+  database_engine: "boltdb"
+repositories:
+   - name: "main"
+     type: "disk"
+     enable: true
+     urls:
+       - "$tmpdir/testbuild"
+EOF
+    luet config --config $tmpdir/luet.yaml
+    res=$?
+    assertEquals 'config test successfully' "$res" "0"
+}
+
+testInstall() {
+    luet install --config $tmpdir/luet.yaml seed/alpine
+    #luet install --config $tmpdir/luet.yaml test/c-1.0 > /dev/null
+    installst=$?
+    assertEquals 'install test successfully' "$installst" "0"
+    assertTrue 'package installed' "[ -e '$tmpdir/testrootfs/bin/busybox' ]"
+    assertTrue 'finalizer runs' "[ -e '$tmpdir/testrootfs/tmp/foo' ]"
+}
+
+
+testCleanup() {
+    luet cleanup --config $tmpdir/luet.yaml
+    installst=$?
+    assertEquals 'install test successfully' "$installst" "0"
+}
+
+# Load shUnit2.
+. "$ROOT_DIR/tests/integration/shunit2"/shunit2
+