only catch Exception, and specifically not GeneratorExit, inside inli…

…neCallbacks

Refs #2395.

master/buildbot/process/botmaster.py

@@ -404,7 +404,7 @@ def _maybeStartBuildsOn(self, new_builders):
             # start the activity loop, if we aren't already working on that.
             if not self.active:
                 self._activityLoop()
-        except:
+        except Exception:
             log.err(Failure(),
                     "while attempting to start builds on %s" % self.name)
 
@@ -460,7 +460,7 @@ def _sortBuilders(self, buildernames):
         try:
             builders = yield defer.maybeDeferred(lambda :
                     sorter(self.master, builders))
-        except:
+        except Exception:
             log.msg("Exception prioritizing builders; order unspecified")
             log.err(Failure())
 
@@ -493,7 +493,7 @@ def _activityLoop(self):
 
             try:
                 yield self._callABuilder(bldr_name)
-            except:
+            except Exception:
                 log.err(Failure(),
                         "from maybeStartBuild for builder '%s'" % (bldr_name,))