s3:printing: Fix %J substition

s3:printing: Fix %J substition

print_run_command() uses lp_print_command() which internally performs basic
substition by calling talloc_sub_basic(). As a result. any of the variables in
the "basic set", including "%J" are already substituted.

To prevent the unwanted subtitution, we declare all affected configuration
options as const, which disabled the basic substition.

As a result print_run_command() can run manual substitution on all characters,
including %J, in the variadic argument list *before* calling lp_string() to run
basic substition which we had disabled before with the const.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=13745

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>
Autobuild-User(master): Andreas Schneider <asn@cryptomilk.org>
Autobuild-Date(master): Thu Nov  7 16:01:21 UTC 2019 on sn-devel-184