Allow # within configuration file comments

Line 20 of /etc/xen-tools/xen-tools.conf says: "Anything following a
'#' character is ignored as a comment."

This patch allows two or more hash characters in one row of the
configuration files.

Everything after the *first* hash is now ignored.

Closes: #783060

lib/Xen/Tools/Common.pm

@@ -70,7 +70,7 @@ sub readConfigurationFile ($$)
         next if ( length($line) < 1 );
 
         # Strip trailing comments.
-        if ( $line =~ /(.*)\#(.*)/ )
+        if ( $line =~ /([^#]*)\#(.*)/ )
         {
             $line = $1;
         }