add single static import: ensure not available when conflict(IDEA-174983)

when methods (> 1) with same name exist in the containing class

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/addSingleStaticImport/ConflictingNamesInScope.java

@@ -0,0 +1,9 @@
+import foo.*;
+class MyTest {
+  {
+    Assert.assert<caret>True(false);
+  }
+  
+  static void assertTrue() {}
+  static void assertTrue(String message, boolean flag) {}
+}