Release 2017.3

It's been almost a month, I think the current git is working well and
not too risky.  We have some new API additions which I think the
various consumers of them are going to want.

Closes: #726
Approved by: jlebon

configure.ac

@@ -1,6 +1,6 @@
 AC_PREREQ([2.63])
 dnl If incrementing the version here, remember to update libostree.sym too
-AC_INIT([libostree], [2017.2], [walters@verbum.org])
+AC_INIT([libostree], [2017.3], [walters@verbum.org])
 AC_CONFIG_HEADER([config.h])
 AC_CONFIG_MACRO_DIR([buildutil])
 AC_CONFIG_AUX_DIR([build-aux])

src/libostree/libostree.sym

@@ -376,15 +376,22 @@ global:
        ostree_repo_reload_config;
 } LIBOSTREE_2017.1;
 
+LIBOSTREE_2017.3 {
+global:
+        ostree_raw_file_to_archive_z2_stream_with_options;
+} LIBOSTREE_2017.2;
+
 /*                         NOTE NOTE NOTE
  * Versions above here are released.  Only add symbols below this line.
  *                         NOTE NOTE NOTE
  */
 
-LIBOSTREE_2017.3 {
+/* Stub section for new version, uncomment when the first symbol is added
+LIBOSTREE_2017.$NEWVERSION {
 global:
-        ostree_raw_file_to_archive_z2_stream_with_options;
+	someostree_symbol_deleteme;
 } LIBOSTREE_2017.2;
+*/
 
 /* Stub section for the stable release *after* this development one; don't
  * edit this other than to update the last number.  This is just a copy/paste