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

compiler/testData/codegen/box/classes/kt1976.kt

@@ -4,5 +4,5 @@ class A {
 
 fun box(): String {
     val a = A()
-    return a.f() // does not work: (in runtime) ClassCastException: A cannot be cast to jet.Function0
+    return a.f() // does not work: (in runtime) ClassCastException: A cannot be cast to kotlin.Function0
 }

compiler/testData/codegen/box/typeMapping/kt3976.kt

@@ -1,4 +1,4 @@
-// java.lang.ClassNotFoundException: jet.Nothing
+// java.lang.ClassNotFoundException: kotlin.Nothing
 
 var currentAccountId: Int? by SessionAccessor()
 class SessionAccessor<T> {

compiler/testData/codegen/box/typeMapping/nothing.kt

@@ -1,5 +1,5 @@
 fun box(): String {
-    // jet.Nothing should not be loaded here
+    // kotlin.Nothing should not be loaded here
     val x = "" is Nothing
     return "OK"
 }

compiler/testData/codegen/box/typeMapping/nullableNothing.kt

@@ -1,6 +1,5 @@
-
 fun box(): String {
-    // This used to be problematic because of an attempt to load jet/Nothing class
+    // This used to be problematic because of an attempt to load kotlin/Nothing class
     val x = "" is Nothing?
     return "OK"
 }

compiler/testData/codegen/boxWithStdlib/regressions/kt528.kt

@@ -4,7 +4,7 @@ import java.io.*
 import java.util.*
 
 fun box() : String {
-    val input = StringReader("/Users/abreslav/work/jet/docs/luhnybin/src/test")
+    val input = StringReader("/aaa/bbb/ccc/ddd")
 
     val luhny = Luhny()
     input.forEachChar {
@@ -86,7 +86,7 @@ class Luhny() {
             toBeMasked--
         }
         else {
-            print(c)
+            // print(c)
         }
     }
 }

compiler/testData/codegen/boxWithStdlib/regressions/kt529.kt

@@ -4,7 +4,7 @@ import java.io.*
 import java.util.*
 
 fun box() : String {
-    val input = StringReader("/Users/abreslav/work/jet/docs/luhnybin/src/test")
+    val input = StringReader("/aaa/bbb/ccc/ddd")
 
     val luhny = Luhny()
     input.forEachChar {
@@ -81,7 +81,7 @@ class Luhny() {
             kotlin.io.print('X')
             toBeMasked--
         } else {
-            kotlin.io.print(c)
+            // kotlin.io.print(c)
         }
     }
 }

compiler/testData/codegen/boxWithStdlib/regressions/kt533.kt

@@ -4,7 +4,7 @@ import java.io.*
 import java.util.*
 
 fun box() : String {
-    val input = StringReader("/Users/abreslav/work/jet/docs/luhnybin/src/test")
+    val input = StringReader("/aaa/bbb/ccc/ddd")
 
     val luhny = Luhny()
     input.forEachChar {
@@ -79,7 +79,7 @@ class Luhny() {
             toBeMasked--
         }
         else {
-            print(c)
+            // print(c)
         }
     }
 }