bitbake: toaster: use force_text instead of force_bytes

Usage of force_bytes in BuildRequest.__str__ method caused
python 3 to throw "__str__ returned non-string (type bytes)"
error.

Replaced force_bytes with force_text to make the code working
on both python 2 and python 3.

[YOCTO #9584]

(Bitbake rev: 9dd9c1393a84d1110c647e84253af8e0bb6acc45)

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

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

@@ -54,8 +54,8 @@ class Command(NoArgsCommand):
                 logger.debug("runbuilds: No build env")
                 return
 
-            logger.debug("runbuilds: starting build %s, environment %s" % \
-                         (str(br).decode('utf-8'), bec.be))
+            logger.info("runbuilds: starting build %s, environment %s" % \
+                        (br, bec.be))
 
             # let the build request know where it is being executed
             br.environment = bec.be

bitbake/lib/toaster/bldcontrol/models.py

@@ -1,7 +1,7 @@
 from __future__ import unicode_literals
 from django.db import models
 from django.core.validators import MaxValueValidator, MinValueValidator
-from django.utils.encoding import force_bytes
+from django.utils.encoding import force_text
 from orm.models import Project, ProjectLayer, ProjectVariable, ProjectTarget, Build, Layer_Version
 
 import logging
@@ -121,7 +121,7 @@ class BuildRequest(models.Model):
         return self.brvariable_set.get(name="MACHINE").value
 
     def __str__(self):
-        return force_bytes('%s %s' % (self.project, self.get_state_display()))
+        return force_text('%s %s' % (self.project, self.get_state_display()))
 
 # These tables specify the settings for running an actual build.
 # They MUST be kept in sync with the tables in orm.models.Project*