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/ostree-repo.h

@@ -101,6 +101,11 @@ GKeyFile *    ostree_repo_get_config (OstreeRepo *self);
 _OSTREE_PUBLIC
 GKeyFile *    ostree_repo_copy_config (OstreeRepo *self);
 
+_OSTREE_PUBLIC
+gboolean      ostree_repo_reload_config (OstreeRepo *self,
+                                         GCancellable *cancellable,
+                                         GError    **error);
+
 _OSTREE_PUBLIC
 gboolean      ostree_repo_remote_add (OstreeRepo     *self,
                                       const char     *name,