Remove ans.pl system test files from gitignore

The ans*.pl scripts are part of system tests and should be part of the
repository. The gitignore entires for these files have been removed.

bin/tests/system/rpzrecurse/.gitignore

@@ -4,7 +4,6 @@
 /ns3/named.conf
 /ns3/named2.conf
 /ns4/named.conf
-/ans5/ans.pl
 /ans5/ans.pid
 /dnsrps-secondary.conf
 /dnsrps.conf

bin/tests/system/serve-stale/.gitignore

@@ -1,5 +1,4 @@
 /ans2/ans.pid
-/ans2/ans.pl
 /ns1/named.conf
 /ns3/named.conf
 /ns3/root.bk