Add API that allows the error status for the response to be reset

This is required to fix an issue with async where a dispatch after an
error is still flagged as an error which causes the dispatch to be
skipped.

java/org/apache/catalina/connector/Response.java

@@ -373,6 +373,11 @@ public boolean setErrorReported() {
     }
 
 
+    public void resetError() {
+        getCoyoteResponse().resetError();
+    }
+
+
     /**
      * Perform whatever actions are required to flush and close the output stream or writer, in a single operation.
      *

java/org/apache/coyote/Response.java

@@ -333,6 +333,11 @@ public boolean setErrorReported() {
     }
 
 
+    public void resetError() {
+        errorState.set(0);
+    }
+
+
     // -------------------- Methods --------------------
 
     public void reset() throws IllegalStateException {
@@ -656,7 +661,7 @@ public void recycle() {
         committed = false;
         commitTimeNanos = -1;
         errorException = null;
-        errorState.set(0);
+        resetError();
         headers.recycle();
         trailerFieldsSupplier = null;
         // Servlet 3.1 non-blocking write listener