restore the interrupt flag whenever we catch InterruptedException

[ahgittin]

Speculative fix for #800

[codecov-commenter]

Codecov Report

Merging #801 (5695b7d) into master (5674072) will decrease coverage by 0.17%.
The diff coverage is 25.00%.

@@             Coverage Diff              @@
##             master     #801      +/-   ##
============================================
- Coverage     64.91%   64.74%   -0.18%     
+ Complexity     1462     1459       -3     
============================================
  Files           210      210              
  Lines          8516     8520       +4     
  Branches        778      778              
============================================
- Hits           5528     5516      -12     
- Misses         2585     2598      +13     
- Partials        403      406       +3     

Impacted Files	Coverage Δ
src/main/java/net/schmizz/concurrent/Promise.java	80.30% <0.00%> (-1.24%)	⬇️
...zz/sshj/connection/channel/ChannelInputStream.java	78.78% <0.00%> (-1.22%)	⬇️
...va/net/schmizz/sshj/connection/channel/Window.java	53.06% <0.00%> (-1.11%)	⬇️
src/main/java/net/schmizz/keepalive/KeepAlive.java	75.00% <100.00%> (+0.92%)	⬆️
...net/schmizz/sshj/transport/TransportException.java	33.33% <0.00%> (-22.23%)	⬇️
...ain/java/net/schmizz/sshj/common/SSHException.java	61.29% <0.00%> (-12.91%)	⬇️
.../main/java/net/schmizz/sshj/sftp/PacketReader.java	91.48% <0.00%> (-4.26%)	⬇️
...java/net/schmizz/sshj/transport/TransportImpl.java	65.14% <0.00%> (-1.66%)	⬇️
...in/java/net/schmizz/sshj/common/SecurityUtils.java	47.91% <0.00%> (+1.04%)	⬆️

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