bitbake: toaster: Fix build execution regression

Make sure the error value is initialised and update the string match
that we have to identify bitbake's current startup status.

Patch contribution from Eduard Bartosh

(Bitbake rev: 915ba08a8a3013e9787e564f2ffd8698c948f433)

Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/ui/toasterui.py

@@ -239,6 +239,7 @@ def main(server, eventHandler, params ):
 
             if isinstance(event, (bb.event.BuildCompleted, bb.command.CommandFailed)):
 
+		errorcode = 0
                 if (isinstance(event, bb.command.CommandFailed)):
                     errors += 1
                     errorcode = 1

bitbake/lib/toaster/bldcontrol/localhostbecontroller.py

@@ -139,7 +139,7 @@ class LocalhostBEController(BuildEnvironmentController):
             with open(filepath, "r") as f:
                 f.seek(filepos)
                 for line in f:
-                    if line.startswith("NOTE: ToasterUI waiting for events"):
+                    if line.startswith("Bitbake server started on demand"):
                         return True
             return False