deployment: retrieve SSH keys from mgmt server

As supported by ngcpcfg-api as of svn r11744.

If this works as expected then the only:

  ssh-keyscan $MANAGEMENT_IP >> ~/.ssh/known_hosts

should be needed for automatic SSH login between nodes in carrier
environment.  A working version of "ngcpcfg init_mgmt
$MANAGEMENT_IP" should be quite close then.

Let's see what's the opinion of Jenkins + our autodeploy jobs...

From: Michael Prokop <mprokop@sipwise.com>

deployment.sh

@@ -1142,6 +1142,29 @@ EOF
     esac
   fi
 
+  if "$RETRIEVE_MGMT_CONFIG" ; then
+    password=sipwise
+    echo "Retrieving SSH keys from management server (using password ${password})"
+
+    wget --timeout=30 -O "${TARGET}"/root/.ssh/authorized_keys "${MANAGEMENT_IP}:3000/ssh/authorized_keys"
+    wget --timeout=30 -O "${TARGET}"/root/.ssh/id_rsa          "${MANAGEMENT_IP}:3000/ssh/id_rsa?password=${password}"
+    wget --timeout=30 -O "${TARGET}"/root/.ssh/id_rsa.pub      "${MANAGEMENT_IP}:3000/ssh/id_rsa_pub"
+
+    chmod 600 "${TARGET}"/root/.ssh/authorized_keys
+    chmod 600 "${TARGET}"/root/.ssh/id_rsa
+    chmod 644 "${TARGET}"/root/.ssh/id_rsa.pub
+
+    wget --timeout=30 -O "${TARGET}"/etc/ssh/ssh_host_dsa_key     "${MANAGEMENT_IP}:3000/ssh/host_dsa_key?password=${password}"
+    wget --timeout=30 -O "${TARGET}"/etc/ssh/ssh_host_dsa_key.pub "${MANAGEMENT_IP}:3000/ssh/host_dsa_key_pub"
+    wget --timeout=30 -O "${TARGET}"/etc/ssh/ssh_host_rsa_key     "${MANAGEMENT_IP}:3000/ssh/host_rsa_key?password=${password}"
+    wget --timeout=30 -O "${TARGET}"/etc/ssh/ssh_host_rsa_key.pub "${MANAGEMENT_IP}:3000/ssh/host_rsa_key_pub"
+
+    chmod 600 "${TARGET}"/etc/ssh/ssh_host_dsa_key
+    chmod 644 "${TARGET}"/etc/ssh/ssh_host_dsa_key.pub
+    chmod 600 "${TARGET}"/etc/ssh/ssh_host_rsa_key
+    chmod 644 "${TARGET}"/etc/ssh/ssh_host_rsa_key.pub
+  fi
+
   # make sure all services are stopped
   for service in \
     apache2 \