deploy: Write bootloader config even if just kernel arguments changed

The official way to add bootloader arguments to the current deployment
is to redeploy with --karg.  However, doing so tripped up an
optimization made inside the deployment code to just swap the
bootlinks if we're keeping the same "bootcsum".

Change this optimization to look at the pair of (bootcsum, options).

tests/test-admin-deploy-karg.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+# Copyright (C) 2011 Colin Walters <walters@verbum.org>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+set -e
+
+. $(dirname $0)/libtest.sh
+
+echo "1..1"
+
+setup_os_repository "archive-z2" "syslinux"
+
+echo "ok setup"
+
+echo "1..1"
+
+ostree --repo=sysroot/ostree/repo pull-local --remote=testos testos-repo testos/buildmaster/x86_64-runtime
+rev=$(ostree --repo=sysroot/ostree/repo rev-parse testos/buildmaster/x86_64-runtime)
+export rev
+# This initial deployment gets kicked off with some kernel arguments 
+ostree admin --sysroot=sysroot deploy --karg=root=LABEL=MOO --karg=quiet --os=testos testos:testos/buildmaster/x86_64-runtime
+ostree admin --sysroot=sysroot deploy --karg=FOO=BAR --os=testos testos:testos/buildmaster/x86_64-runtime
+ostree admin --sysroot=sysroot deploy --karg=TESTARG=TESTVALUE --os=testos testos:testos/buildmaster/x86_64-runtime
+assert_file_has_content sysroot/boot/loader/entries/ostree-testos-1.conf 'options.*FOO=BAR'
+assert_file_has_content sysroot/boot/loader/entries/ostree-testos-0.conf 'options.*FOO=BAR'
+assert_file_has_content sysroot/boot/loader/entries/ostree-testos-0.conf 'options.*TESTARG=TESTVALUE'
+ostree admin --sysroot=sysroot deploy --karg=ANOTHERARG=ANOTHERVALUE --os=testos testos:testos/buildmaster/x86_64-runtime
+assert_file_has_content sysroot/boot/loader/entries/ostree-testos-0.conf 'options.*TESTARG=TESTVALUE'
+assert_file_has_content sysroot/boot/loader/entries/ostree-testos-0.conf 'options.*ANOTHERARG=ANOTHERVALUE'
+
+echo "ok deploy with --karg, but same config"