Support core library

To support core library, "Openjdk9", "No_standard_libs" and metalava
properties are added to java_sdk_library.
If core_lib is true, dist paths are changed to
apistubs/core/....
impl library name is changed to {module_name}.jar instead of
{module_name}.impl.jar

Bug: 110404779
Test: m -j
Change-Id: Ieb6248ea714b4260333d8bf61573d4f3413f7f24