Rename package in JPS plugin tests

Package 'kotlin' is not supported until package views are implemented, because
its name clashes with the stdlib

Original commit: 2af8dd4298

jps/jps-plugin/testData/JKJInheritanceProject/src/java/JSecond.java

@@ -1,7 +1,7 @@
 package java;
 
-public class JSecond extends kotlin.KFirst {
+public class JSecond extends kt.KFirst {
     public void bar() {
         foo();
     }
-}
+}

jps/jps-plugin/testData/JKJInheritanceProject/src/kotlin/KFirst.kt

@@ -1,5 +1,5 @@
-package kotlin
+package kt
 
 open class KFirst(): java.JFirst() {
 
-}
+}

jps/jps-plugin/testData/KJKInheritanceProject/src/java/JFirst.java

@@ -1,4 +1,4 @@
 package java;
 
-public class JFirst extends kotlin.KFirst {
+public class JFirst extends kt.KFirst {
-}
+}

jps/jps-plugin/testData/KJKInheritanceProject/src/kotlin/KFirst.kt

@@ -1,6 +1,6 @@
-package kotlin
+package kt
 
 open class KFirst() {
     fun foo() {
     }
-}
+}

jps/jps-plugin/testData/KJKInheritanceProject/src/kotlin/KSecond.kt

@@ -1,7 +1,7 @@
-package kotlin
+package kt
 
 class KSecond(): java.JFirst() {
     fun bar() {
         foo()
     }
-}
+}