Support all ELBv2 ListenerRule condition types (#4066)

* ELBv2 - ListenerRule condition validation

- ListenerRule condition model now uses upper case field names that
  match input params for boto and CloudFormation.
- BaseResponse._get_params() introduced to make it easier to deal
  with the querystring input params.

tests/test_core/test_responses.py

@@ -2,6 +2,8 @@ from __future__ import unicode_literals
 
 import sure  # noqa
 
+from moto.compat import OrderedDict
+
 from botocore.awsrequest import AWSPreparedRequest
 
 from moto.core.responses import AWSServiceSpec, BaseResponse
@@ -92,3 +94,56 @@ def test_parse_qs_unicode_decode_error():
     body = b'{"key": "%D0"}, "C": "#0 = :0"}'
     request = AWSPreparedRequest("GET", "http://request", {"foo": "bar"}, body, False)
     BaseResponse().setup_class(request, request.url, request.headers)
+
+
+def test_get_params():
+    subject = BaseResponse()
+    subject.querystring = OrderedDict(
+        [
+            ("Action", ["CreateRule"]),
+            ("Version", ["2015-12-01"]),
+            (
+                "ListenerArn",
+                [
+                    "arn:aws:elasticloadbalancing:us-east-1:1:listener/my-lb/50dc6c495c0c9188/80139731473870416"
+                ],
+            ),
+            ("Priority", ["100"]),
+            ("Conditions.member.1.Field", ["http-header"]),
+            ("Conditions.member.1.HttpHeaderConfig.HttpHeaderName", ["User-Agent"]),
+            ("Conditions.member.1.HttpHeaderConfig.Values.member.2", ["curl"]),
+            ("Conditions.member.1.HttpHeaderConfig.Values.member.1", ["Mozilla"]),
+            ("Actions.member.1.FixedResponseConfig.StatusCode", ["200"]),
+            ("Actions.member.1.FixedResponseConfig.ContentType", ["text/plain"]),
+            ("Actions.member.1.Type", ["fixed-response"]),
+        ]
+    )
+
+    result = subject._get_params()
+
+    result.should.equal(
+        {
+            "Action": "CreateRule",
+            "Version": "2015-12-01",
+            "ListenerArn": "arn:aws:elasticloadbalancing:us-east-1:1:listener/my-lb/50dc6c495c0c9188/80139731473870416",
+            "Priority": "100",
+            "Conditions": [
+                {
+                    "Field": "http-header",
+                    "HttpHeaderConfig": {
+                        "HttpHeaderName": "User-Agent",
+                        "Values": ["Mozilla", "curl"],
+                    },
+                }
+            ],
+            "Actions": [
+                {
+                    "Type": "fixed-response",
+                    "FixedResponseConfig": {
+                        "StatusCode": "200",
+                        "ContentType": "text/plain",
+                    },
+                }
+            ],
+        }
+    )