8071851: Provide filtering of doclint checking based on packages
Summary: Introducing -Xdoclint/package:<packages> doclint option to enable/disable checking of specified packages.
Reviewed-by: jjg, darcy

8009924: some langtools tools do not accept -cp as an alias for -classpath
Reviewed-by: jjg

8006263: Supplementary test cases needed for doclint
Reviewed-by: mcimadamore
Contributed-by: peter.jensen@oracle.com