Add mimetype assignments to lighttpd to fix issue with
unassigned file types being sent without Last-Modified header.
Change-Id: I62e3b2b0cb70c29585b2db1ad85e8ba1ec53acfa
Issue-ID: INT-278
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
 }
 
 mimetype.assign = (
-  ".html" => "text/html"
+  ".log" => "text/plain",
+  ".txt" => "text/plain",
+  ".html" => "text/html",
+  ".xml" => "text/xml"
 )
 
 static-file.exclude-extensions = ( ".fcgi", ".php", ".rb", "~", ".inc", ".cgi" )