[s4] "realm" handling

[Matthias Dieter Wallnöfer]

Hi Andrew & list,

through some checks and work on the s4 codebase I discovered that the 
handling of the realm value (lp_realm(...) call) is a bit a mess. 
Sometimes it is upcased in the right manner when in use by KERBEROS, 
sometimes not and especially it's never lowcased when used as DNS domain.

Therefore I propose this patch. Please comment on!

Matthias
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