Bug 426259, restore the vars for the external staging, p=rtessner, r=me

tools/release/configs/tb-moz18-bootstrap.cfg

@@ -56,14 +56,16 @@ ausServerUrl         = https://aus2.mozilla.org
 buildTree       = MozillaRelease
 # where QA updates/builds go
 stagingUser     = cltbld
-stagingServer   = stage-old.mozilla.org
+stagingServer   = production-1.8-master.build.mozilla.org
+externalStagingUser     = cltbld
+externalStagingServer   = stage-old.mozilla.org
 # where beta updates/builds go
 ftpServer       = ftp.mozilla.org
 # where release updates/builds go
 bouncerServer   = download.mozilla.org
 # username and server to push builds
 sshUser         = cltbld
-sshServer       = stage-old.mozilla.org
+sshServer       = production-1.8-master.build.mozilla.org
 # force 1.8 specific behavior
 useTalkback     = 0
 symbolServer     = stage-old.mozilla.org