bitbake: knotty: Use non-interactive mode as fallback for dumb terminals

TERM=dumb bitbake X

shows no output for task status which is suboptimal. Use the non-interactive
mode if the terminal doesn't support what we need for interactive mode giving
a better user experience. Also print a note to the console to say this has
happened.

[YOCTO #8768]

(Bitbake rev: 6f84cf4bd77f35fcd07e0b2f5149f1d6866a414d)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/knotty.py

@@ -174,6 +174,10 @@ class TerminalFilter(object):
             self.rows, self.columns = self.getTerminalColumns()
         except:
             self.cuu = None
+        if not self.cuu:
+            self.interactive = False
+            bb.note("Unable to use interactive mode for this terminal, using fallback")
+            return
         console.addFilter(InteractConsoleLogFilter(self, format))
         errconsole.addFilter(InteractConsoleLogFilter(self, format))