CS-14684 - ec2-describe-instances - Not able to use ip-address filter to list an instance with the provided ip-address.

Changes:
- awsapi was using a wrong name for the public ip field in response, so the ip address was not getting parsed out of the json response.

awsapi/src/com/cloud/stack/models/CloudStackUserVm.java

@@ -54,7 +54,7 @@ public class CloudStackUserVm {
     private String hostName;
     @SerializedName(ApiConstants.HYPERVISOR)
     private String hypervisor;    
-    @SerializedName(ApiConstants.IP_ADDRESS)
+    @SerializedName(ApiConstants.PUBLIC_IP)
     private String ipAddress;
     @SerializedName(ApiConstants.ISO_DISPLAY_TEXT)
     private String isoDisplayText;