Merge fixes for patch release 1.5.1 (aws#364)

* fix: Adding pathParameters to v2 proxy event as reported in aws#358.

* fix: Address JSON content type issue reported in aws#352 and aws#344

* fix: Fixed bug caught by integration tests for aws#352

* fix: Fix struts tests for the changes made for aws#352

* test: Attempting to replicate the issue reported in aws#342

* test: Reverting exception test in Spring package since it's only available in Spring5, not Spring4

* fix: Sigh, forgot to remove the import for the class that doesn't exist from the previous commit

* fix: Addresses bug reported in query string parsing (aws#363) for HTTP API support where we have a query string key, followed by a value declarator (=), but then no value

* chore: Update GitHub issue and PR templates

* fix: Fixed issue reported by SpotBugs with the exception logging of the HTTP API query string parsing

aws-serverless-java-container-springboot2/src/test/java/com/amazonaws/serverless/proxy/spring/ServletAppTest.java

@@ -23,7 +23,8 @@
 import java.util.Collection;
 import java.util.stream.Collectors;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
 
 @RunWith(Parameterized.class)
 public class ServletAppTest {
@@ -191,18 +192,4 @@ public void springExceptionMapping_throw404Ex_expectMappedTo404() {
         assertNotNull(resp);
         assertEquals(404, resp.getStatusCode());
     }
-
-    @Test
-    public void echoMessage_populatesSingleValueHeadersForHttpApiV2() {
-        AwsProxyRequestBuilder req = new AwsProxyRequestBuilder("/message", "POST")
-                .header(HttpHeaders.CONTENT_TYPE, "application/json;v=1")
-                .header(HttpHeaders.ACCEPT, "application/json;v=1")
-                .body(new MessageData("test message"));
-        AwsProxyResponse resp = handler.handleRequest(req, lambdaContext);
-        if ("HTTP_API".equals(type)) {
-            assertNotNull(resp.getHeaders());
-        } else {
-            assertNull(resp.getHeaders());
-        }
-    }
 }