Fix logging in parallel tasks after threading change

[coleaeason]

@rafecolton Please review. A small bug from the threading change I noticed this morning:

pgab -H "bastion*" -- 'ls'
[INFO] Matched hosts: ["bastion1.lax", "bastion1.rno", "bastion1.sjc"]
[bastion1.lax] Executing task '<remainder>'
[bastion1.rno] Executing task '<remainder>'
[bastion1.sjc] Executing task '<remainder>'
[bastion1.sjc] run: ls
[bastion1.rno] run: ls
[bastion1.lax] run: ls
[None] out: REDACTED
[None] out: REDACTED
[None] out:

Disconnecting from bastion1.sjc ... done.
[None] out: REDACTED
[None] out:

Disconnecting from bastion1.sjc ... done.
Disconnecting from bastion1.rno ... done.
[None] out: REDACTED
[None] out:

Disconnecting from bastion1.sjc ... done.
Disconnecting from bastion1.lax ... done.

Done.

The output from each task is missing the host string.

Fix by passing a thread local copy of the env into the sub thread that runs the task from the parent thread that runs each host connection:

uv run saltfab -P -H 'bastion*' -- 'ls'
[INFO] Matched hosts: ["bastion1.lax", "bastion1.rno", "bastion1.sjc"]
[bastion1.lax] Executing task '<remainder>'
[bastion1.rno] Executing task '<remainder>'
[bastion1.sjc] Executing task '<remainder>'
[bastion1.sjc] run: ls
[bastion1.rno] run: ls
[bastion1.lax] run: ls
[bastion1.lax] out: REDACTED
[bastion1.lax] out:

Disconnecting from bastion1.lax ... done.
[bastion1.rno] out: REDACTED
[bastion1.rno] out:

Disconnecting from bastion1.rno ... done.
[bastion1.sjc] out: REDACTED
[bastion1.sjc] out: REDACTED
[bastion1.sjc] out:

Disconnecting from bastion1.sjc ... done.

Done.

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