[Samba] "print command" %J substitution broken after 4.7

[Franz Sirl]

Hi,

after samba-4.7 (tested with samba-4.9.5, but probably 4.8 is already 
affected when I read the git logs correctly) the %J jobname substitution 
is no longer working. It now shows the IP address with underscores. 
Based on this I believe the commit 
ca66efc24181ba6a7a4c13397af514b0972b4855 is the culprit.
I hope "print command" can return to its documented behaviour, as %J is 
used in production here.

Franz Sirl