forbid compiling code in packages with names starting with 'kotlin' unless the -Xallow-kotlin-package command line option is specified

compiler/testData/cli/jvm/extraHelp.out

@@ -5,6 +5,7 @@ where advanced options include:
   -Xno-optimize              Disable optimizations
   -Xreport-perf              Report detailed performance statistics
   -Xmultifile-facades-open   Compile multifile facade classes as open
+  -Xallow-kotlin-package     Allow compiling code in package 'kotlin'
   -Xno-inline                Disable method inlining
   -Xrepeat <count>           Repeat compilation (for performance analysis)
   -Xplugin <path>            Load plugins from the given classpath

compiler/testData/cli/jvm/kotlinPackage.args

@@ -0,0 +1,3 @@
+$TESTDATA_DIR$/kotlinPackage.kt
+-d
+$TEMP_DIR$

compiler/testData/cli/jvm/kotlinPackage.kt

@@ -0,0 +1,4 @@
+package kotlin.mylibrary
+
+class MyLibraryManager {
+}

compiler/testData/cli/jvm/kotlinPackage.out

@@ -0,0 +1,4 @@
+compiler/testData/cli/jvm/kotlinPackage.kt:1:1: error: only the Kotlin standard library is allowed to use the 'kotlin' package
+package kotlin.mylibrary
+^
+COMPILATION_ERROR