JDK 14 RFR of JDK-8231442 : Suppress warnings on non-serializable instance fields in java.sql.* modules

[Joe Darcy]

Hello,

Next step in the serialization warnings pre-cleanup is java.sql.* 
modules. Please review the proposed changes:

    JDK-8231442 : Suppress warnings on non-serializable instance fields 
in java.sql.* modules
    http://cr.openjdk.java.net/~darcy/8231442.0/

Several of the writeObject methods do runtime checks on whether on not 
objects pointed to by the fields in question are serializable. The 
fields with this runtime check get a explanatory comment noting that 
different from the usual comment.

Thanks,

-Joe