Update PKIServer.create_logs_dir()

The PKIServer.create_logs_dir() has been updated to always create
the backup folder since the CI expects the folder to exist even if
there are no upgrade scripts for the current version.

base/server/python/pki/server/__init__.py

@@ -840,6 +840,10 @@ def create_logs_dir(self, exist_ok=False):
             # Create /var/log/pki/<instance>
             self.makedirs(self._logs_dir, exist_ok=exist_ok)
 
+            # Create /var/log/pki/<instance>/backup
+            backup_dir = os.path.join(self._logs_dir, 'backup')
+            self.makedirs(backup_dir, exist_ok=exist_ok)
+
             # Link /var/lib/pki/<instance>/logs to /var/log/pki/<instance>
             self.symlink(self._logs_dir, self.logs_dir, exist_ok=exist_ok)
 
@@ -848,6 +852,10 @@ def create_logs_dir(self, exist_ok=False):
         # Create /var/lib/pki/<instance>/logs
         self.makedirs(self.logs_dir, exist_ok=exist_ok)
 
+        # Create /var/lib/pki/<instance>/logs/backup
+        backup_dir = os.path.join(self.logs_dir, 'backup')
+        self.makedirs(backup_dir, exist_ok=exist_ok)
+
     def create_libs(self, force=False):  # pylint: disable=W0613
 
         lib_dir = os.path.join(PKIServer.SHARE_DIR, 'server', 'lib')