java completion: rewrite else/catch/finally keyword suggestions, add tests

java/java-tests/testData/codeInsight/completion/keywords/elseAfterRBrace.java

@@ -0,0 +1,6 @@
+public class A {
+  public void method() {
+    if (true) { foo(); }
+    <caret>
+  }
+}

java/java-tests/testData/codeInsight/completion/keywords/elseAfterSemicolon.java

@@ -0,0 +1,6 @@
+public class A {
+  public void method() {
+    if (true) foo();
+    <caret>
+  }
+}

java/java-tests/testData/codeInsight/completion/keywords/secondCatch.java

@@ -0,0 +1,26 @@
+import java.lang.Exception;
+
+/*
+ * Copyright 2000-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+public class A{
+ public void method(){
+  try{
+   String str = "";
+  }
+  catch (Exception e) {}
+  <caret>
+ }
+}