bitbake: toaster: fix wrong usage of print_exc and format_exc

First parameter of traceback.print_exc and traceback.format_exc APIs is
a 'limit' - a number of stracktraces to print.

Passing exception object to print_exc or format_exc is incorrect, but
it works in Python 2 and causes printing only one line of traceback.

In Python 3 comparison of integer and exception object throws exception:
TypeError: unorderable types: int() < <Exception type>()

As these APIs are usually used in except block of handling another
exception this can cause hard to find and debug bugs.

(Bitbake rev: c5a48931ac8db9e56f978c50861c19d0d0c808e3)

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

bitbake/lib/toaster/bldcontrol/management/commands/checksettings.py

@@ -118,7 +118,7 @@ class Command(NoArgsCommand):
                     except Exception as e:
                         print("Failure while trying to import the toaster config file %s: %s" %\
                             (config_file, e))
-                        traceback.print_exc(e)
+                        traceback.print_exc()
 
                 return is_changed
 

bitbake/lib/toaster/bldcontrol/management/commands/runbuilds.py

@@ -68,7 +68,7 @@ class Command(NoArgsCommand):
 
         except Exception as e:
             logger.error("runbuilds: Error launching build %s" % e)
-            traceback.print_exc(e)
+            traceback.print_exc()
             if "[Errno 111] Connection refused" in str(e):
                 # Connection refused, read toaster_server.out
                 errmsg = bec.readServerLogFile()
@@ -78,7 +78,7 @@ class Command(NoArgsCommand):
             BRError.objects.create(req = br,
                     errtype = str(type(e)),
                     errmsg = errmsg,
-                    traceback = traceback.format_exc(e))
+                    traceback = traceback.format_exc())
             br.state = BuildRequest.REQ_FAILED
             br.save()
             bec.be.lock = BuildEnvironment.LOCK_FREE