resolve_ipnets(): Canonicalize resolved addresses

The version of JRuby included with puppetserver (as of 7.9.5) does not
canonicalize IPv6 addresses returned by Socket.getaddrinfo, and thus
returns them without compressing runs of zeros. For example, running
resolve_ipnets under puppetserver would return 2001:0db8:0:0:0:0:0:1
if running server-less returned 2001:0db8::1.

Work around the issue by converting resolved addresses to IPAddr
objects, then back to strings.

lib/puppet/parser/functions/resolve_ipnets.rb

@@ -103,7 +103,11 @@ module Puppet::Parser::Functions
 		    ips[info[4]] = []
 		    found_families << info[4]
 		end
-		ips.fetch(info[4]) << info[3]
+		# Canonicalize address using IPAddr so the same representation
+		# is returned regardless of interpreter.
+		# JRuby's Socket.getaddrinfo returns IPv6 addresses without
+		# compressed zeros, while CRuby's does compress zeros.
+		ips.fetch(info[4]) << IPAddr.new(info[3]).to_s
 	    end
 	end
 	ipaddrs = [ ]