Fix 4 bytes utf8 char test comment for create images

This commit fixes the 4 bytes utf8 char test comment. Because the bug
1370954 was already fixed. However, nova and glance don't accept a 4
bytes utf8 char, yet. And also, the URL[1] in the comment isn't correct,
either, anymore. So this commit also fixes the URL, too.

[1] http://www.fileformat.info/info/unicode/char/1F4A9/index.htm

Related-Bug: #1370954
Change-Id: I19bba38e11a3ab9d97a0caa0f73c14772e01c1bf
1 file changed