Updated default ini attributes to work with private IP addresses

sample-ec2/ec2.ini

diff --git a/sample-ec2/ec2.ini b/sample-ec2/ec2.ini
index 36b3921..e60abf9 100644
--- a/sample-ec2/ec2.ini
+++ b/sample-ec2/ec2.ini
@@ -27,7 +27,8 @@
 # address, and should set this to 'private_dns_name'. The key of an EC2 tag
 # may optionally be used; however the boto instance variables hold precedence
 # in the event of a collision.
-destination_variable = public_dns_name
+# destination_variable = public_dns_name
+destination_variable = private_dns_name
 
 # This allows you to override the inventory_name with an ec2 variable, instead
 # of using the destination_variable above. Addressing (aka ansible_ssh_host)
@@ -42,8 +43,8 @@
 # the boto instance variables hold precedence in the event of a collision.
 # WARNING: - instances that are in the private vpc, _without_ public ip address
 # will not be listed in the inventory until You set:
-# vpc_destination_variable = private_ip_address
-vpc_destination_variable = ip_address
+vpc_destination_variable = private_ip_address
+# vpc_destination_variable = ip_address
 
 # The following two settings allow flexible ansible host naming based on a
 # python format string and a comma-separated list of ec2 tags.  Note that: