Delete traces of "jet" in test data and unimportant code

compiler/testData/diagnostics/tests/dataFlow/local/kt2835.kt

@@ -2,7 +2,7 @@ open class X(val s: String)
 
 fun f(a: String?) {
     if (a != null) {
-        object : X(<!DEBUG_INFO_SMARTCAST!>a<!>) { // Type mismatch: inferred type is jet.String? but jet.String was expected
+        object : X(<!DEBUG_INFO_SMARTCAST!>a<!>) { // Type mismatch: inferred type is kotlin.String? but kotlin.String was expected
         }
     }
-}
+}

compiler/testData/diagnostics/tests/inference/regressions/kt2294.kt

@@ -6,8 +6,8 @@ public fun foo<E>(array: Array<E>): Array<E> = array
 public fun test()
 {
     val x = foo(array(1, 2, 3, 4, 5)) // Should infer type 'Int'
-    //            ^--- public final fun <T : jet.Any? > array(vararg t : DONT_CARE) : jet.Array<DONT_CARE> defined in Kotlin
-    //       ^--- public final fun <E : jet.Any? > foo(items t : jet.Array<DONT_CARE>) : jet.Array<DONT_CARE> defined in root package
+    //            ^--- public final fun <T : kotlin.Any? > array(vararg t : DONT_CARE) : kotlin.Array<DONT_CARE> defined in Kotlin
+    //       ^--- public final fun <E : kotlin.Any? > foo(items t : kotlin.Array<DONT_CARE>) : kotlin.Array<DONT_CARE> defined in root package
     x : Array<Int>
 }
 

compiler/testData/diagnostics/tests/inference/regressions/kt3150.kt

@@ -18,7 +18,7 @@ fun test() {
     val mapperFunction = {(i: Int)-> }
     SomeTemplate().query(mapperFunction)
 
-    // TYPE_MISMATCH: Required Class<[ERROR: CANT_INFER]>, Found (jet.Int) -> Unit
+    // TYPE_MISMATCH: Required Class<[ERROR: CANT_INFER]>, Found (kotlin.Int) -> Unit
     SomeTemplate().query {(i: Int)-> }
     SomeTemplate().query1 {(i: Int)-> }
-}
+}

compiler/testData/diagnostics/tests/j+k/kt2394.kt

@@ -1,4 +1,4 @@
-//KT-2394 java.lang.Iterable<T> should be visible as jet.Iterable<out T>
+//KT-2394 java.lang.Iterable<T> should be visible as kotlin.Iterable<out T>
 package d
 
 fun foo(iterable: Iterable<Int>, iterator: Iterator<Int>, comparable: Comparable<Any>) {

compiler/testData/diagnostics/tests/nullabilityAndSmartCasts/kt2336.kt

@@ -2,10 +2,10 @@ fun main(args: Array<String>) {
     val b: Boolean? = null
     if (b != null) {
         if (!<!DEBUG_INFO_SMARTCAST!>b<!>) {} // OK
-        if (<!DEBUG_INFO_SMARTCAST!>b<!>) {} // Error: Condition must be of type jet.Boolean, but is of type jet.Boolean?
-        if (b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>) {} // WARN: Unnecessary non-null assertion (!!) on a non-null receiver of type jet.Boolean?
+        if (<!DEBUG_INFO_SMARTCAST!>b<!>) {} // Error: Condition must be of type kotlin.Boolean, but is of type kotlin.Boolean?
+        if (b<!UNNECESSARY_NOT_NULL_ASSERTION!>!!<!>) {} // WARN: Unnecessary non-null assertion (!!) on a non-null receiver of type kotlin.Boolean?
         foo(<!DEBUG_INFO_SMARTCAST!>b<!>) // OK
     }
 }
 
-fun foo(a: Boolean) = a
+fun foo(a: Boolean) = a

compiler/testData/diagnostics/tests/regressions/kt2376.kt

@@ -1,5 +1,5 @@
 // FILE: main.kt
-//KT-2376 java.lang.Number should be visible in Kotlin as jet.Number
+//KT-2376 java.lang.Number should be visible in Kotlin as kotlin.Number
 fun main(args: Array<String>) {
     Test().number(5.toInt())
 }

compiler/testData/diagnostics/tests/smartCasts/inference/kt4415.kt

@@ -8,7 +8,7 @@ object A {
     fun toJson2(obj:Any){
         if(obj is SelfJson){
             // A.find( (obj as SelfJson).javaClass)  // OK
-            A.find( <!DEBUG_INFO_SMARTCAST!>obj<!>.javaClass )   // ERROR:  Type mismatch: inferred type is jet.Any but SelfJson was expected
+            A.find( <!DEBUG_INFO_SMARTCAST!>obj<!>.javaClass )   // ERROR:  Type mismatch: inferred type is kotlin.Any but SelfJson was expected
         }
     }
 }