The ns2/named-alt3.conf.in config file was removed in
f8e264ba6d0583732bed5950f832ecb3cba8186e. From then on, system test
reports:
sed: can't read ns2/named-alt3.conf.in: No such file or directory"
Drop the last remnant of ns2/named-alt3.conf.in.
copy_setports ns2/named-alt1.conf.in ns2/named-alt1.conf
copy_setports ns2/named-alt2.conf.in ns2/named-alt2.conf
-copy_setports ns2/named-alt3.conf.in ns2/named-alt3.conf
copy_setports ns2/named-alt4.conf.in ns2/named-alt4.conf
copy_setports ns2/named-alt5.conf.in ns2/named-alt5.conf
copy_setports ns2/named-alt6.conf.in ns2/named-alt6.conf