add symbolServer and symbolDir b=401202 r=nthomas

tools/release/configs/fx-moz18-nightly-bootstrap.cfg

@@ -77,5 +77,10 @@ bouncerServer   = staging-1.8-master.build..mozilla.org
 sshUser         = cltbld
 sshServer       = staging-1.8-master.build.mozilla.org
 useTalkback     = 1
+symbolServer     = staging-1.8-master.mozilla.org
+symbolServerUser = cltbld
+symbolServerPath = /data/symbols
+symbolServerKey  = /home/cltbld/.ssh/id_dsa
+symbolDir        = /builds/symbols
 # turn off tests
 runMozillaTests = 0