scripts/lib/argparse_oe: tweak title above options

Naming these as "optional arguments" is perhaps slightly confusing since
some of the positional arguments might also be optional; in addition
it's rare (though possible) for options to be mandatory - up until
recently we had a recipetool option (-o) that was mandatory. It's not
perfect, but change it to "options" so it's at least a bit more
appropriate.

(From OE-Core rev: 55e675de6191bf7eccd26df29189f2a6faa40a20)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/argparse_oe.py

@@ -51,6 +51,10 @@ class ArgumentSubParser(ArgumentParser):
         if 'order' in kwargs:
             self._order = kwargs.pop('order')
         super(ArgumentSubParser, self).__init__(*args, **kwargs)
+        for agroup in self._action_groups:
+            if agroup.title == 'optional arguments':
+                agroup.title = 'options'
+                break
 
     def parse_known_args(self, args=None, namespace=None):
         # This works around argparse not handling optional positional arguments being