Improved ssh retry mechanism

[LanderOtto]

This commit improves the retry mechanism to be more resilent. Before this commit, the mechanism involves only the connection opening. Now, it covers both connection opening and connection communication exceptions.

Moreover, the close method of the SSHContext class was fixed calling the asynchronous wait_closed method of the asyncssh library and writing the EOF when the writer stream is closed. It avoids to re-open the connection before that previous one was completely closed.

Finally, three logging messages were fixed. A Docker DEBUG logging message has new line at the end of the message. The step exit status was in lowercase, but in StreamFlow the status is showed in uppercase. The logging of commands executed remotely though SSHConnector were not printed because there was an wrong operation association between an inline if-else and two f-strings.

[codecov]

Codecov Report

Attention: Patch coverage is 77.55102% with 11 lines in your changes missing coverage. Please review.

Project coverage is 69.90%. Comparing base (d3c8b95) to head (14b696b).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
streamflow/deployment/connector/ssh.py	77.55%	6 Missing and 5 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #501      +/-   ##
==========================================
- Coverage   69.94%   69.90%   -0.04%     
==========================================
  Files          87       87              
  Lines       10882    10889       +7     
  Branches     2548     2548              
==========================================
+ Hits         7611     7612       +1     
- Misses       2798     2802       +4     
- Partials      473      475       +2     

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