Summary: Cleanup of javadoc -Xlint errors
Reviewed-by: lancea, mduigou, darcy, mullan, mchung

Summary: Correct the behavior of available() and update related java specs for available() and skip() in InputStream and FileInputStream classes.
Reviewed-by: alanb

Reviewed-by: chegar, ksrini

Reviewed-by: hawtin, chegar

Reviewed-by: darcy, weijun

Reviewed-by: sherman, martin