puppet: Remove unused 'builder' files.

These are leftover detritus from the "builder" host, which was removed
in 4c9a283542.

puppet/zulip_ops/files/builder/sbuildrc

@@ -1,21 +0,0 @@
-# Mail address where logs are sent to (mandatory, no default!)
-$mailto = 'buildd-maintainers@zulip.net';
-
-# Directory for chroot symlinks and sbuild logs.  Defaults to the
-# current directory if unspecified. (Deprecated.) Leave this unset;
-# umt compare-bin relies upon this being unset.
-#
-# The above comment is a lie. ~ lfaraone
-$build_dir='/home/zulip/ubuntu/build';
-
-# Directory for writing build logs to
-$log_dir="/home/zulip/ubuntu/logs";
-
-# Override default sbuild dependency resolver (see 'man sbuild'). The default
-# resolver (apt) mostly works ok but not always (eg, oneiric libreoffice).
-# Use 'apt', 'aptitude', 'internal'. Can also use '--build-dep-resolver' with
-# sbuild or '--sbuild-dep-resolver' with umt.
-#$build_dep_resolver="apt";
-
-# don't remove this, Perl needs it:
-1;