Fix escaping in WildcardHostMatcher (#382)

* Escape '[' and ']' in WildcardHostMatcher

* Anchoring regex to match entire string (Fixes #381)

src/main/java/net/schmizz/sshj/transport/verification/OpenSSHKnownHosts.java

@@ -360,7 +360,7 @@ public class OpenSSHKnownHosts
         }
 
         protected String getHostPart() {
-            return  hostPart;
+            return hostPart;
         }
     }