smbserver: remove a temporary file before exit

[dfandrich]

Each execution of test 1451 would leave a file in /tmp before.

Closes #10990

It's not completely clear to me the purpose of this file, but the test succeeds fine with the path gone.

[dfandrich]

It seems that this causes the tests to hang on Windows. Maybe that has to do with Windows' inability to delete an open file. I'll try another approach.

[dfandrich]

The solution necessary to cleanly shut down the SMB server was pretty involved, but it should do the trick. It might be able to be made cleaner if there were a relevant impacket method to override, but I'm pretty sure something like this would be needed anyway to cleanly shut down the server.

[sonatype-lift]

vulture-100: unused variable 'frame'

---

ℹ️ Expand to see all @sonatype-lift commands

You can reply with the following commands. For example, reply with @sonatype-lift ignoreall to leave out all findings.

Command	Usage
@sonatype-lift ignore	Leave out the above finding from this PR
@sonatype-lift ignoreall	Leave out all the existing findings from this PR
@sonatype-lift exclude <file|issue|path|tool>	Exclude specified file|issue|path|tool from Lift findings by updating your config.toml file

Note: When talking to LiftBot, you need to refresh the page to see its response.
_{Click here to add LiftBot to another repo.}

[dfandrich]

fixed

[sonatype-lift]

vulture-100: unused variable 'signum'

---

ℹ️ Expand to see all @sonatype-lift commands

You can reply with the following commands. For example, reply with @sonatype-lift ignoreall to leave out all findings.

Command	Usage
@sonatype-lift ignore	Leave out the above finding from this PR
@sonatype-lift ignoreall	Leave out all the existing findings from this PR
@sonatype-lift exclude <file|issue|path|tool>	Exclude specified file|issue|path|tool from Lift findings by updating your config.toml file

Note: When talking to LiftBot, you need to refresh the page to see its response.
_{Click here to add LiftBot to another repo.}

[dfandrich]

fixed