Optimize Imports should remove unused import alias

#KT-17375 Fixed

idea/testData/editor/optimizeImports/common/ConflictWithAlias.kt

@@ -1,4 +1,5 @@
 import name
 import name as names
 
-val a = name
+val a = name
+val b = names

idea/testData/editor/optimizeImports/common/ConflictWithAlias.kt.after

@@ -2,3 +2,4 @@ import name
 import name as names
 
 val a = name
+val b = names

idea/testData/editor/optimizeImports/common/IteratorFunction.dependency.kt

@@ -1,9 +1,8 @@
 package test1
 
-public class MyClass {
-}
+class MyClass
 
-public fun MyClass.iterator(): Iterator<MyClass> {
+operator fun MyClass.iterator(): Iterator<MyClass> {
      return object: Iterator<MyClass> {
          override fun next(): MyClass {
              throw Exception()

idea/testData/editor/optimizeImports/common/TwoConstructors.kt.after

@@ -1,5 +1,5 @@
 // NAME_COUNT_TO_USE_STAR_IMPORT: 2
-import p1.*
+import p1.A
 import p2.A
 
 fun f() {

idea/testData/editor/optimizeImports/common/TwoConstructors.kt.log

@@ -6,4 +6,3 @@ Additional checking of reference KtSimpleNameReference: A
 Changed resolve of KtSimpleNameReference: A
 Additional checking of reference KtInvokeFunctionReference: A("")
 Additional checking of reference KtInvokeFunctionReference: A(1)
-Trying to build import list again with import rules: +p2.A, +p1.*