Update module-info exports for stdlib and suppress warnings

- include kotlin.time package

Suppress module-info warnings:

- terminal digits in module name
- open/export for another not yet built dependee module

#KT-21266

libraries/stdlib/jdk7/java9/module-info.java

@@ -1,3 +1,4 @@
+@SuppressWarnings("module") // suppress warnings about terminal digit and exporting packages to not-yet-built kotlin-stdlib-jdk8
 module kotlin.stdlib.jdk7 {
     requires transitive kotlin.stdlib;
 

libraries/stdlib/jdk8/java9/module-info.java

@@ -1,3 +1,4 @@
+@SuppressWarnings("module") // suppress warning about terminal digit
 module kotlin.stdlib.jdk8 {
     requires transitive kotlin.stdlib;
     requires kotlin.stdlib.jdk7;

libraries/stdlib/jvm/java9/module-info.java

@@ -1,3 +1,4 @@
+@SuppressWarnings("module") // suppress warnings about opening packages to not-yet-built kotlin-reflect
 module kotlin.stdlib {
     exports kotlin;
     exports kotlin.annotation;
@@ -20,12 +21,7 @@ module kotlin.stdlib {
     exports kotlin.sequences;
     exports kotlin.system;
     exports kotlin.text;
-
+    exports kotlin.time;
-    // do not export experimental coroutines packages
-    //exports kotlin.coroutines.experimental;
-    //exports kotlin.coroutines.experimental.intrinsics;
-    //exports kotlin.coroutines.experimental.jvm.internal;
-    //exports kotlin.coroutines.experimental.migration;
 
     exports kotlin.experimental;
 
@@ -33,7 +29,7 @@ module kotlin.stdlib {
     exports kotlin.jvm.internal;
     exports kotlin.jvm.internal.markers;
 
-    // Open packages with .kotlin_builtins files to kotlin-reflect, to allow reflection to load built-in declarations there
+    // Open packages with .kotlin_builtins files to kotlin-reflect, to allow reflection to load built-in declarations from there
     opens kotlin to kotlin.reflect;
     opens kotlin.annotation to kotlin.reflect;
     opens kotlin.collections to kotlin.reflect;