Remove the "fingerprint" parameter.

This commit actually only disables the "fingerprint" parameter. Even
though we gave people a 1 month warning, it might happen that somebody
comes along next week and tells us their truly important use case why
they still need this parameter. Once we're really sure this won't
happen, we can rip out some more code that was necessary to implement
this parameter.

Implements #26919.

CHANGELOG.md

@@ -6,6 +6,7 @@
      documents.
    - Change "3_months" graphs to "6_months" graphs in all documents
      containing history objects.
+   - Remove the "fingerprint" parameter.
 
 
 # Changes in version 6.2-1.17.1 - 2018-08-17

src/main/java/org/torproject/onionoo/server/ResourceServlet.java

@@ -68,7 +68,7 @@ public class ResourceServlet extends HttpServlet {
   private static final long CACHE_INTERVAL = 5L * 60L * 1000L;
 
   private static Set<String> knownParameters = new HashSet<>(
-      Arrays.asList("type", "running", "search", "lookup", "fingerprint",
+      Arrays.asList("type", "running", "search", "lookup",
           "country", "as", "as_name", "flag", "first_seen_days",
           "last_seen_days", "contact", "order", "limit", "offset", "fields",
           "family", "version", "os", "host_name", "recommended_version"));

src/test/java/org/torproject/onionoo/server/ResourceServletTest.java

@@ -1056,37 +1056,37 @@ public class ResourceServletTest {
 
   @Test(timeout = 100)
   public void testFingerprintRelayFingerprint() {
-    this.assertSummaryDocument(
+    this.assertErrorStatusCode(
         "/summary?fingerprint=000C5F55BD4814B917CC474BD537F1A3B33CCE2A",
-        1, new String[] { "TorkaZ" }, 0, null);
+        400);
   }
 
   @Test(timeout = 100)
   public void testFingerprintRelayHashedFingerprint() {
-    this.assertSummaryDocument(
+    this.assertErrorStatusCode(
         "/summary?fingerprint=4aa14c08d62913e0057a9ad5863b458c0ce94cee",
-        0, null, 0, null);
+        400);
   }
 
   @Test(timeout = 100)
   public void testFingerprintBridgeHashedFingerprint() {
-    this.assertSummaryDocument(
+    this.assertErrorStatusCode(
         "/summary?fingerprint=1FEDE50ED8DBA1DD9F9165F78C8131E4A44AB756",
-        0, null, 1, new String[] { "gummy" });
+        400);
   }
 
   @Test(timeout = 100)
   public void testFingerprintBridgeHashedHashedFingerprint() {
-    this.assertSummaryDocument(
+    this.assertErrorStatusCode(
         "/summary?fingerprint=CE52F898DB3678BCE33FAC28C92774DE90D618B5",
-        0, null, 0, null);
+        400);
   }
 
   @Test(timeout = 100)
   public void testFingerprintBridgeOriginalFingerprint() {
-    this.assertSummaryDocument(
+    this.assertErrorStatusCode(
         "/summary?fingerprint=0010D49C6DA1E46A316563099F41BFE40B6C7183",
-        0, null, 0, null);
+        400);
   }
 
   @Test(timeout = 100)