Update to 1.18.

- Update upstream URLs.
- Package DNF plugin.
- Slightly modernize spec file.

etckeeper-makefile-remove-python-plugins.patch

@@ -0,0 +1,30 @@
+diff -up etckeeper-1.18/Makefile.orig etckeeper-1.18/Makefile
+--- etckeeper-1.18/Makefile.orig	2015-03-20 16:53:23.681037197 +0100
++++ etckeeper-1.18/Makefile	2015-03-20 16:56:28.697621078 +0100
+@@ -13,11 +13,8 @@ CP=cp -R
+ INSTALL=install 
+ INSTALL_EXE=${INSTALL}
+ INSTALL_DATA=${INSTALL} -m 0644
+-PYTHON=python
+ 
+ build: etckeeper.spec etckeeper.version
+-	-$(PYTHON) ./etckeeper-bzr/__init__.py build || echo "** bzr support not built"
+-	-$(PYTHON) ./etckeeper-dnf/etckeeper.py build || echo "** DNF support not built"
+ 
+ install: etckeeper.version
+ 	mkdir -p $(DESTDIR)$(etcdir)/etckeeper/ $(DESTDIR)$(vardir)/cache/etckeeper/
+@@ -45,14 +42,10 @@ ifeq ($(HIGHLEVEL_PACKAGE_MANAGER),yum)
+ 	mkdir -p $(DESTDIR)$(etcdir)/yum/pluginconf.d
+ 	$(INSTALL_DATA) yum-etckeeper.conf $(DESTDIR)$(etcdir)/yum/pluginconf.d/etckeeper.conf
+ endif
+-ifeq ($(HIGHLEVEL_PACKAGE_MANAGER),dnf)
+-	-$(PYTHON) ./etckeeper-dnf/etckeeper.py install --root=$(DESTDIR) ${PYTHON_INSTALL_OPTS} || echo "** DNF support not installed"
+-endif
+ ifeq ($(HIGHLEVEL_PACKAGE_MANAGER),zypper)
+ 	mkdir -p $(DESTDIR)$(prefix)/lib/zypp/plugins/commit
+ 	$(INSTALL) zypper-etckeeper.py $(DESTDIR)$(prefix)/lib/zypp/plugins/commit/zypper-etckeeper.py
+ endif
+-	-$(PYTHON) ./etckeeper-bzr/__init__.py install --root=$(DESTDIR) ${PYTHON_INSTALL_OPTS} || echo "** bzr support not installed"
+ 	echo "** installation successful"
+ 
+ clean: etckeeper.spec etckeeper.version