Fn::Replace support for type Number

Currently Fn:Replace works just with type String:
{Fn:Replace [{'str': 'new_str'}, 'change str']}

After this fix it will work for type Number:
{Fn:Replace [{'str': 42}, 'change str']}

Change-Id: I709a3350b5676bd9db8bac92e07ad105466bd187
Closes-Bug: #1256326
Merge "Fn::Replace support for type Number"