Simplify build exception handling

- Drop EventException
- Use FuncFailed as the primary function failure exception, using TaskFailed
  for the event (leaving it up to the process running exec_{func,task} to
  display the more detailed information available in the exception).
- Switch InvalidTask to an exception rather than an event, as that's a
  critical issue.
- Reduce the number of messages shown to the user when a task fails -- they
  don't need to be told it fails 12 times.  Work remains in this area though.

(Bitbake rev: 06b742aae2b8013cbb269cc30554cff89e3a5667)

Signed-off-by: Chris Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>

bitbake/lib/bb/shell.py

@@ -180,11 +180,9 @@ class BitBakeShellCommands:
             last_exception = Providers.NoProvider
 
         except runqueue.TaskFailure as fnids:
-            for fnid in fnids:
-                print("ERROR: '%s' failed" % td.fn_index[fnid])
             last_exception = runqueue.TaskFailure
 
-        except build.EventException as e:
+        except build.FuncFailed as e:
             print("ERROR: Couldn't build '%s'" % names)
             last_exception = e
 
@@ -247,7 +245,7 @@ class BitBakeShellCommands:
             cooker.buildFile(bf, cmd)
         except parse.ParseError:
             print("ERROR: Unable to open or parse '%s'" % bf)
-        except build.EventException as e:
+        except build.FuncFailed as e:
             print("ERROR: Couldn't build '%s'" % name)
             last_exception = e