Add pub key to the VM booted by vagrant

so that the ./tool/init-runonce can use the key

Change-Id: I50e5540a24ddda9d8266585e7cb13fb8e3ad4473
Closes-Bug: #1498240

vagrant/Vagrantfile

@@ -62,6 +62,8 @@ Vagrant.configure(2) do |config|
     chmod 600 /root/.ssh/id_rsa
     echo '#{my_publickey}' > /root/.ssh/authorized_keys
     chmod 600 /root/.ssh/authorized_keys
+    echo '#{my_publickey}' > /root/.ssh/id_rsa.pub
+    chmod 644 /root/.ssh/id_rsa.pub
     mkdir -p /home/vagrant/.ssh
     echo '#{my_privatekey}' >> /home/vagrant/.ssh/id_rsa
     chmod 600 /home/vagrant/.ssh/*