template packages: install changelog and copyright

Lintian throws an un-overridable error because the binary packages that
contain the templates do not have a copyright and changelog.
Instead of skipping them in the dh_installdocs step, install just the
copyright and changelog.

debian/changelog

@@ -16,6 +16,9 @@ grub2 (2.02+dfsg1-5) UNRELEASED; urgency=medium
   * Add template for signing monolithic EFI binaries
   * debian/build-efi-images: Use correct EFI vendor (closes: #769172)
 
+  [ Luca Boccassi ]
+  * template packages: install changelog and copyright
+
  -- Philipp Hahn <hahn@univention.de>  Wed, 27 Jun 2018 09:13:55 +0200
 
 grub2 (2.02+dfsg1-4) unstable; urgency=medium

debian/rules

@@ -476,7 +476,8 @@ endif
 
 override_dh_installdocs:
 	dh_installdocs $(patsubst %,-p%,$(filter grub-common grub-rescue-pc grub-firmware-qemu grub-xen-host,$(BUILD_PACKAGES))) -A AUTHORS NEWS README THANKS TODO
-	dh_installdocs $(patsubst %,-N%,$(filter grub-efi-%-signed-template,$(BUILD_PACKAGES))) --remaining-packages --link-doc=grub-common
+	dh_installdocs $(patsubst %,-p%,$(filter grub-efi-%-signed-template,$(BUILD_PACKAGES)))
+	dh_installdocs --remaining-packages --link-doc=grub-common
 
 ifeq ($(FLICKER_FREE_BOOT),yes)
 override_dh_installinit: