PY3: Fix dict keys when using salt.filesystem.FSChan (#33077)
PY3: Fix dict keys when using salt.filesystem.FSChan (#33077)

salt/fileclient.py:
- For `RemoteClient.get_file`, sometimes `self.channel` is
a `salt.filesystem.FSChan` object. When this is the case, it is
not getting the data from a remote system, so the returned dict
keys are already string objects (as opposed to when getting them
remotely, the dict keys are bytes objects due to raw mode). To
account for this, convert all the top-level keys in the returned
dict to strings so that the logic may correctly process them.

Signed-off-by: Sergey Kizunov <dfddabaa9af05982b01940b837a87844148069c9@ni.com>
saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt