lib: Add ostree_repo_reload_config()

For a long time we've cached the remote configs in the repo, which
mostly makes sense for the `repo/config` file, but less sense
for `/etc/ostree/remotes.d`, because we want to support admins
interactively editing them.

One can delete the repo instance and create a new one, but that's a bit ugly.
Let's introduce an API for this so rpm-ostree can reload remotes after
admins/scripts edit them in `/etc`.  We also might as well reload
any other entries in the config.

Structurually now, `ostree_repo_open()` deals with file descriptors, and then
calls `ostree_repo_reload_config()`. Except for the uncompressed cache, which is
the only thing that deals with FDs that can be configured. But we want to delete
that anyways.

No tests, since...we don't have a daemon in this codebase, don't want to shave
that yak just today.

Closes: #662
Approved by: jlebon

src/libostree/libostree.sym

@@ -376,9 +376,9 @@ global:
  *                         NOTE NOTE NOTE
  */
 
-LIBOSTREE_2017.XX {
+LIBOSTREE_2017.2 {
 global:
-	someostree_symbol_deleteme;
+       ostree_repo_reload_config;
 } LIBOSTREE_2017.1;
 
 /* Stub section for the stable release *after* this development one; don't