add rpmdb support; enhance integration tests

integration/test-fixtures/image-pkg-coverage/var/lib/dpkg/status

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+Package: apt
+Status: install ok installed
+Priority: required
+Section: admin
+Installed-Size: 4064
+Maintainer: APT Development Team <deity@lists.debian.org>
+Architecture: amd64
+Version: 1.8.2
+Source: apt-dev
+Replaces: apt-transport-https (<< 1.5~alpha4~), apt-utils (<< 1.3~exp2~)
+Provides: apt-transport-https (= 1.8.2)
+Depends: adduser, gpgv | gpgv2 | gpgv1, debian-archive-keyring, libapt-pkg5.0 (>= 1.7.0~alpha3~), libc6 (>= 2.15), libgcc1 (>= 1:3.0), libgnutls30 (>= 3.6.6), libseccomp2 (>= 1.0.1), libstdc++6 (>= 5.2)
+Recommends: ca-certificates
+Suggests: apt-doc, aptitude | synaptic | wajig, dpkg-dev (>= 1.17.2), gnupg | gnupg2 | gnupg1, powermgmt-base
+Breaks: apt-transport-https (<< 1.5~alpha4~), apt-utils (<< 1.3~exp2~), aptitude (<< 0.8.10)
+Conffiles:
+ /etc/apt/apt.conf.d/01autoremove 76120d358bc9037bb6358e737b3050b5
+ /etc/cron.daily/apt-compat 49e9b2cfa17849700d4db735d04244f3
+ /etc/kernel/postinst.d/apt-auto-removal 4ad976a68f045517cf4696cec7b8aa3a
+ /etc/logrotate.d/apt 179f2ed4f85cbaca12fa3d69c2a4a1c3
+Description: commandline package manager
+ This package provides commandline tools for searching and
+ managing as well as querying information about packages
+ as a low-level access to all features of the libapt-pkg library.
+ .
+ These include:
+  * apt-get for retrieval of packages and information about them
+    from authenticated sources and for installation, upgrade and
+    removal of packages together with their dependencies
+  * apt-cache for querying available information about installed
+    as well as installable packages
+  * apt-cdrom to use removable media as a source for packages
+  * apt-config as an interface to the configuration settings
+  * apt-key as an interface to manage authentication keys
+

integration/test-fixtures/image-pkg-coverage/var/lib/rpm/generate-fixture.sh

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+#!/usr/bin/env bash
+set -eux
+
+docker create --name generate-rpmdb-fixture centos:latest sh -c 'tail -f /dev/null'
+
+function cleanup {
+  docker kill generate-rpmdb-fixture
+  docker rm generate-rpmdb-fixture
+}
+trap cleanup EXIT
+
+docker start generate-rpmdb-fixture
+docker exec -i --tty=false generate-rpmdb-fixture bash <<-EOF
+  mkdir -p /scratch
+  cd /scratch
+  rpm --initdb --dbpath /scratch
+  curl -sSLO https://github.com/wagoodman/dive/releases/download/v0.9.2/dive_0.9.2_linux_amd64.rpm
+  rpm --dbpath /scratch -ivh dive_0.9.2_linux_amd64.rpm
+  rm dive_0.9.2_linux_amd64.rpm
+  rpm --dbpath /scratch -qa
+EOF
+
+docker cp generate-rpmdb-fixture:/scratch/Packages .