Create Firefox extension on upgrade and replica-install

If the signing cert is not available, create an unsigned extension.

Add a zip dependency to the specfile.

https://fedorahosted.org/freeipa/ticket/3150

install/tools/ipa-replica-install

@@ -217,6 +217,8 @@ def install_http(config, auto_redirect):
             print "error copying files: " + str(e)
             sys.exit(1)
 
+    http.setup_firefox_extension(config.realm_name, config.domain_name)
+
     return http
 
 def install_bind(config, options):