Add Dockerfile and build script; update .gitignore and installation paths

debian/install

@@ -1,4 +1,4 @@
 src/etc/sysctl.d/99-cloud-router.conf             etc/sysctl.d/
-src/usr/local/sbin/simple-ca                      usr/local/sbin/
+src/opt/cloud-router/bin/simple-ca                opt/cloud-router/bin/
 src/usr/lib/cloud-router/configure                usr/lib/cloud-router/
 src/usr/share/cloud-router/templates/*            usr/share/cloud-router/templates/