Install bash completion

Closes: #902450

debian/control

@@ -4,6 +4,7 @@ Priority: optional
 Maintainer: Debian Libvirt Maintainers <pkg-libvirt-maintainers@lists.alioth.debian.org>
 Uploaders: Guido Günther <agx@sigxcpu.org>, Laurent Léonard <laurent@open-minds.org>
 Build-Depends:
+ bash-completion,
  debhelper (>= 9.20160709~),
  dh-autoreconf,
  dh-apparmor [linux-any],

debian/libvirt-daemon.install

@@ -3,6 +3,7 @@ usr/lib/libvirt/libvirt*
 usr/lib/libvirt/lock-driver/lockd.so
 usr/lib/libvirt/connection-driver
 usr/share/augeas/*
+usr/share/bash-completion/*
 usr/share/libvirt/*
 usr/share/man/man8/*
 usr/lib/libvirt/storage-backend/libvirt_storage_backend_disk.so