Add md5 check base-setup

install/base-setup

 #!/bin/bash
 
+
+FUNCTION_COMMON_SCRIPT_MD5=c2c47abe028a98d5b9309116816efe9f
 wget --no-check-certificate https://lab.nexedi.cn/rafael/slapos.playbook/raw/master/install/function-common -O /tmp/function-common
 
+if [ "`md5sum /tmp/function-common | cut -f1 -d\  `" !=  "$FUNCTION_COMMON_SCRIPT_MD5" ]; then
+  echo "ERROR: /tmp/function-common has wrong md5 `md5sum /tmp/function-common | cut -f1 -d\  ` != $FUNCTION_COMMON_SCRIPT_MD5"
+  exit 1
+fi
+
 source /tmp/function-common
 
 function download_playbook {