Retry partial authentication with all remaining auth methods (Fixes #812)

[hierynomus]

[codecov-commenter]

Codecov Report

Merging #820 (d7dd73b) into master (6e7fb96) will decrease coverage by 0.01%. The diff coverage is 59.09%.

@@             Coverage Diff              @@
##             master     #820      +/-   ##
============================================
- Coverage     64.84%   64.83%   -0.02%     
- Complexity     1467     1468       +1     
============================================
  Files           210      211       +1     
  Lines          8537     8553      +16     
  Branches        781      785       +4     
============================================
+ Hits           5536     5545       +9     
- Misses         2592     2597       +5     
- Partials        409      411       +2     

Impacted Files	Coverage Δ
src/main/java/net/schmizz/sshj/SSHClient.java	58.60% <50.00%> (-1.06%)	:arrow_down:
...n/java/net/schmizz/sshj/userauth/UserAuthImpl.java	77.19% <50.00%> (-4.63%)	:arrow_down:
...ain/java/net/schmizz/sshj/userauth/AuthResult.java	100.00% <100.00%> (ø)
.../main/java/net/schmizz/sshj/sftp/PacketReader.java	95.74% <0.00%> (+4.25%)	:arrow_up:

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[vladimirlagunov]

I can backport some of our changes with plenty of tests, though they're in Kotlin, which would require time for complete rewriting to Java.

[jamespowenjr]

Sorry for taking so long to get to this. I tested this branch with nifi and unfortunately I still get the same error of "net.schmizz.sshj.userauth.UserAuthException: Exhausted available authentication methods" when the order is backwards from how the AuthMethods are added to the client.