misc/dashboard: remove limit for json package list

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/4937048

misc/dashboard/godashboard/package.py

@@ -211,7 +211,7 @@ class PackagePage(webapp.RequestHandler):
             q = Package.all()
             s = '{"packages": ['
             sep = ''
-            for r in q.fetch(1000):
+            for r in q:
                 s += '%s\n\t{"path": "%s", "last_install": "%s", "count": "%s"}' % (sep, r.path, r.last_install, r.count)
                 sep = ','
             s += '\n]}\n'