fix testcase expecting incorrect remove log from dpkg

dpkg 1.18.11 includes:
  * Do not log nor print duplicate dpkg removal action. We print
    “Removing <package> (<version>)” lines and log remove action twice
    when purging a package from frontends, because they usually first call
    --remove and then --purge sequentially. When purging a package which is
    already in config-files (i.e. it has been removed before), do not print
    nor log the remove action.

test/integration/test-no-fds-leaked-to-maintainer-scripts

@@ -77,7 +77,26 @@ checkpurge() {
 	tail -n +3 rootdir/var/log/apt/term.log | head -n -1 > terminal.log
 	testfileequal 'terminal.log' "$(cat terminal.output)"
 
-	testequal "startup packages remove
+	if dpkg --compare-versions "$(dpkg_version)" 'ge' '1.18.11'; then
+		testequal "startup packages remove
+status installed $PKGNAME 1.0
+remove $PKGNAME 1.0 <none>
+status half-configured $PKGNAME 1.0
+status half-installed $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+startup packages configure
+startup packages purge
+purge $PKGNAME 1.0 <none>
+status config-files $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+status config-files $PKGNAME 1.0
+status not-installed $PKGNAME <none>
+startup packages configure" cut -f 3- -d' ' rootdir/var/log/dpkg.log
+	else
+		testequal "startup packages remove
 status installed $PKGNAME 1.0
 remove $PKGNAME 1.0 <none>
 status half-configured $PKGNAME 1.0
@@ -95,6 +114,7 @@ status config-files $PKGNAME 1.0
 status config-files $PKGNAME 1.0
 status not-installed $PKGNAME <none>
 startup packages configure" cut -f 3- -d' ' rootdir/var/log/dpkg.log
+	fi
 	testequalor2 "dpkg-query: no packages found matching ${PKGNAME}" "No packages found matching ${PKGNAME}." dpkg -l "$PKGNAME"
 }
 checkpurge