Add a timeout argument to _exec_command

[dhirschfeld]

Fixes #15

[dhirschfeld]

This is the minimum fix required to get fs.sshfs working for my usecase.

[dhirschfeld]

This appears to have caused something else to hang? I don't think this change should have done that.

[althonos]

@dhirschfeld: I think the hang comes from additional tests Will has added to Pyfilesystem2 in the latest release. They also cause one of my other extensions to hang. I'll investigate.

[willmcgugan]

Is that the worker threads change to copy/move? Could have exposed a thread-safety issue.

I've just recalled there is a thread_safe meta value. I should probably do a non-threaded copy if that is False.

[althonos]

@willmcgugan : probably, yes !

Still, I expected this extension to be thread-safe since I'm locking whenever I access the underlying _sftp attribute !

[dhirschfeld]

RE: thread safety, see also #17.

[codecov-io]

Codecov Report

Merging #16 into master will decrease coverage by 0.63%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   97.41%   96.78%   -0.64%     
==========================================
  Files           5        5              
  Lines         310      311       +1     
==========================================
- Hits          302      301       -1     
- Misses          8       10       +2

Impacted Files	Coverage Δ
fs/sshfs/sshfs.py	95.28% <66.66%> (-0.93%)	:arrow_down:

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