Changing network_configuration_spec to match for either index-based D…

…NS entry or id-based DNS entry.

* This is to make BATs compatible with global-net

[#103551020](https://www.pivotaltracker.com/story/show/103551020)

Signed-off-by: Shatarupa Nandi <snandi@pivotal.io>

spec/system/network_configuration_spec.rb

@@ -32,7 +32,7 @@
 
     it 'reverse looks up instance' do
       name = dns.getname(public_ip).to_s
-      expect(name).to eq("0.batlight.static.bat.#{bosh_tld}")
+      expect(name).to include("0.batlight.static.bat.#{bosh_tld}")
     end
 
     it 'resolves instance names from deployed VM' do