remote/coordinator: show error reason for failed exporter commands

If an acquire or release failed on the exporter, we should add the
reason to the exception.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>

Author: jluebbe

labgrid/remote/coordinator.py

@@ -592,7 +592,7 @@ async def _acquire_resource(self, place, resource):
         self.get_exporter_by_name(resource.path[0]).queue.put_nowait(cmd)
         await cmd.wait()
         if not cmd.response.success:
-            raise ExporterError("failed to acquire {resource}")
+            raise ExporterError("failed to acquire {resource} ({cmd.response.reason})")
         if resource.acquired != place.name:
             logging.warning("resource %s not acquired by this place after acquire request", resource)
 
@@ -648,7 +648,7 @@ async def _release_resources(self, place, resources, callback=True):
                     self.get_exporter_by_name(resource.path[0]).queue.put_nowait(cmd)
                     await cmd.wait()
                     if not cmd.response.success:
-                        raise ExporterError(f"failed to release {resource}")
+                        raise ExporterError(f"failed to release {resource} ({cmd.response.reason})")
                     if resource.acquired:
                         logging.warning("resource %s still acquired after release request", resource)
             except (ExporterError, TimeoutError):