config variables should not be restricted to double quoted strings

previously, these two would produce different results

    config aa.bb = 'true'   # config file line includes single quotes
    config aa.bb = "true"   # config file line does not include any quotes

Now the former will also behave like the latter.

src/gitolite.pm

@@ -439,7 +439,7 @@ sub setup_git_configs
         my $rc = $rch{$seq};
         while ( my ($key, $value) = each(%{ $rc }) ) {
             if ($value ne "") {
-                $value =~ s/^"(.*)"$/$1/;
+                $value =~ s/^['"](.*)["']$/$1/;
                 system("git", "config", $key, $value);
             } else {
                 system("git", "config", "--unset-all", $key);