devtool: modify: make -x the default behaviour

It's going to be more common for users not to have the prepared source
tree for a recipe already, so the default behaviour ought to be to
extract it for them from the recipe. Change the default to extract
(effectively making the -x option a no-op) and add a --no-extract/-n
option to disable it. Later we can look at trying to be smart and
reusing an existing source tree instead of erroring out if it exists;
for now this is just the default reversal.

(From OE-Core rev: 80a44e52609a89d9ffe816181ae193af491c06ac)

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

meta/lib/oeqa/selftest/devtool.py

@@ -570,7 +570,8 @@ class DevtoolTests(DevtoolBase):
         self.track_for_cleanup(self.workspacedir)
         self.add_command_to_tearDown('bitbake-layers remove-layer */workspace')
         # (don't bother with cleaning the recipe on teardown, we won't be building it)
-        result = runCmd('devtool modify %s -x %s' % (testrecipe, tempdir))
+        # We don't use -x here so that we test the behaviour of devtool modify without it
+        result = runCmd('devtool modify %s %s' % (testrecipe, tempdir))
         # Check git repo
         self._check_src_repo(tempdir)
         # Add a couple of commits