Create ~/.ssh if non-existing

Change-Id: I180baa4a799cdb59ed7ecac84b9f203a463a64e7
diff --git a/tools/test/bin/onos-push-keys b/tools/test/bin/onos-push-keys
index cf9fd02..1eb1eec 100755
--- a/tools/test/bin/onos-push-keys
+++ b/tools/test/bin/onos-push-keys
@@ -10,6 +10,7 @@
 
 scp -q ~/.ssh/id_rsa.pub $remote:/tmp
 ssh $remote "
+    mkdir -p ~/.ssh
     cat /tmp/id_rsa.pub >> ~/.ssh/authorized_keys
     sort -u ~/.ssh/authorized_keys > ~/.ssh/authorized_keys.bak
     mv ~/.ssh/authorized_keys.bak ~/.ssh/authorized_keys