Import upstream socket commits

Upstream changes:

    7085981: XXSocket types depend on impl finalizer to close if constructor throws exception
    Reviewed-by: alanb, chegar

    http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/e995c36bb1eb

    7088747: Use multicatch in Socket constructor
    Reviewed-by: alanb

    http://hg.openjdk.java.net/jdk8/jdk8/jdk/rev/e995c36bb1eb

Bug: 29067535
Change-Id: I20b2d2b7f128b38e20d313b1e9043157ddf5ebba