pull: Add per-remote cookie jar

Optionally read cookie jars for a remote to be used when downloading
data. This can be used for private repositories which require specific
cookies to be present, e.g. repositories hosted on Amazon cloudfront
using signed cookies.

Closes: #531
Approved by: cgwalters

src/libostree/ostree-fetcher.h

@@ -59,6 +59,9 @@ OstreeFetcher *_ostree_fetcher_new (int                      tmpdir_dfd,
 
 int  _ostree_fetcher_get_dfd (OstreeFetcher *fetcher);
 
+void _ostree_fetcher_set_cookie_jar (OstreeFetcher *self,
+                                     const char    *jar_path);
+
 void _ostree_fetcher_set_proxy (OstreeFetcher *fetcher,
                                 const char    *proxy);