fix ReleaseProject model class for tarball-base

The string tarball-base is not a valid python identifier, so we can't
just pass it to the constructor directly.

Change-Id: Ie1446f1fc24468e9149d68f709ce52aadabd611a
Signed-off-by: Doug Hellmann <doug@doughellmann.com>

openstack_releases/deliverable.py

@@ -224,12 +224,17 @@ class Repo(object):
 
 class ReleaseProject(object):
 
-    def __init__(self, repo, hash, release):
+    def __init__(self, repo, hash, data, release=None):
         self._repo = repo
         self.repo = release.deliv.get_repo(repo)
         self.hash = hash
+        self._data = data
         self.release = weakref.proxy(release)
 
+    @property
+    def tarball_base(self):
+        return self._data.get('tarball-base')
+
 
 class Release(object):
 
@@ -237,7 +242,7 @@ class Release(object):
         self.version = version
         self.deliv = weakref.proxy(deliv)
         self._projects = {
-            p['repo']: ReleaseProject(release=self, **p)
+            p['repo']: ReleaseProject(p['repo'], p['hash'], p, self)
             for p in projects
         }