log: Do not log stack trace on disco#info timeout.

[bgrozev]

No description provided.

[codecov]

Codecov Report

Merging #1109 (c2f5b96) into master (5acd99d) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1109      +/-   ##
============================================
- Coverage     27.71%   27.70%   -0.02%     
  Complexity      493      493              
============================================
  Files           128      128              
  Lines          7737     7740       +3     
  Branches       1087     1087              
============================================
  Hits           2144     2144              
- Misses         5320     5323       +3     
  Partials        273      273              

Files Changed	Coverage Δ
.../main/kotlin/org/jitsi/jicofo/xmpp/XmppProvider.kt	0.00% <0.00%> (ø)

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