[ssh] Disable UseRoaming due to OpenSSH CVE
http://arstechnica.com/security/2016/01/bug-that-can-leak-crypto-keys-just-fixed-in-widely-used-openssh/
change
commit 32ea60e75dff6e5a0e883bf49c26d907764c28e3
author Alpha Chen <alpha.chen@gmail.com>
date
parent 2072f972 
diff --git a/.ssh/config b/.ssh/config
index f986af26..1174d030 100644
--- a/.ssh/config
+++ b/.ssh/config
@@ -5,6 +5,7 @@ ControlPath /tmp/%r@%h:%p
 ControlPersist yes
 
 Host *
+  UseRoaming no
   IdentityFile ~/.ssh/id_rsa
 
 # For vagrant virtual machines