Add exceptions full info to grpc.py code

[gbregman]

In a lot of places in grpc.py we don't log the full exception info, including the stack trace, but just the error message. We need to go over the code and add the full information.

[baum]

Both exception type at stack trace are lost, when the exception is converted from ex to f"{ex}". Generally, in the code exception should not be converted to string since it looses information. In the current model we see in the log:

2024-02-13 07:57:21 [   ERROR] bdev_rbd_create bdev_f0bec8af-0c1e-4efb-87e6-28f5d672675a failed with:
None (grpc.py:291)

instead of seeing

2024-02-13 10:31:44 [   ERROR] bdev_rbd_create (grpc.py:290)
Traceback (most recent call last):
  File "/src/control/grpc.py", line 277, in create_bdev
    cluster_name=self._get_cluster(anagrp)
  File "/src/control/grpc.py", line 217, in _get_cluster
    cluster_name = self._get_cluster(anagrp)
  File "/src/control/grpc.py", line 215, in _get_cluster
    elif self.clusters[anagrp][self.current_cluster[anagrp]] >= self.bdevs_per_cluster:
KeyError: None