Adding thread id to KRB5_TRACE format output

[Osipov, Michael (LDA IT PLM)]

Hi,

based on some debugging issues it would be really helpful to see after 
[<pid>] also the [<tid>] in KRB5_TRACE output. As far as I can see it is 
printed in krb5int_trace(). Unfortunately, there is no portable (POSIX) 
way to retrieve to retrieve it. Luckily, I have extended some code in 
Tomcat Native recently to cover this on several platforms [1]. Code for 
even more BSDs can be found here [2].

Would be someone willing to file an RT ticket for that? I can easily 
test a PR on RHEL7, FreeBSD 12 and HP-UX 11.31

Regards,

Michael

[1] 
https://github.com/apache/tomcat-native/blob/03fed6c698ac8daf273820056171de85f52e55ec/native/src/jnilib.c#L505-L533
[2] 
https://github.com/nim-lang/Nim/commit/199f061ddc8ac69bfc619670c50ebddfb6ed0fee