TT#43813 define AppConfig for every app as Django 1.11 recommends

> https://docs.djangoproject.com/en/1.11/ref/applications/

Change-Id: I7a26b42af05a5403048f0348003a743b93ffe273

hotfix/apps.py

@@ -0,0 +1,19 @@
+# Copyright (C) 2020 The Sipwise Team - http://sipwise.com
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+from django.apps import AppConfig
+
+
+class HotfixConfig(AppConfig):
+    name = "hotfix"

panel/apps.py

@@ -0,0 +1,19 @@
+# Copyright (C) 2020 The Sipwise Team - http://sipwise.com
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+from django.apps import AppConfig
+
+
+class PanelConfig(AppConfig):
+    name = "panel"

release_dashboard/apps.py

@@ -0,0 +1,19 @@
+# Copyright (C) 2020 The Sipwise Team - http://sipwise.com
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+from django.apps import AppConfig
+
+
+class ReleaseDashboardConfig(AppConfig):
+    name = "release_dashboard"

repoapi/apps.py

@@ -0,0 +1,19 @@
+# Copyright (C) 2020 The Sipwise Team - http://sipwise.com
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program.  If not, see <http://www.gnu.org/licenses/>.
+from django.apps import AppConfig
+
+
+class RepoAPIConfig(AppConfig):
+    name = "repoapi"

repoapi/settings/common.py

@@ -36,11 +36,11 @@ INSTALLED_APPS = [
     "django_filters",
     "jsonify",
     "export",
-    "repoapi",
-    "hotfix",
-    "panel",
-    "release_dashboard",
-    "build",
+    "repoapi.apps.RepoAPIConfig",
+    "hotfix.apps.HotfixConfig",
+    "panel.apps.PanelConfig",
+    "release_dashboard.apps.ReleaseDashboardConfig",
+    "build.apps.ReleaseConfig",
 ]
 
 MIDDLEWARE_CLASSES = (