7116404: Miscellaneous warnings (java.rmi.**, serialization, some core classes)

[Alan Bateman]

I don't have time on Thursday to get involved in the warnings fest [1]. 
However I would like to contribute something and to that end the 
following webrev proposes changes to eliminate the warnings from several 
classes including java.rmi.**, the serialization classes, and several 
core classes:

http://cr.openjdk.java.net/~alanb/7116404/webrev/

The changes are mostly trivial, and mostly to raw type usages. One 
tricky one ObjectInputStream.readEnum where I had to use a raw type 
(Maurizio and I chatted about this one and there doesn't seem to be a 
better workaround). There is one non-warnings change in 
java.rmi.server.LogStream where I replaced a usage of legacy Hashtable 
with a HashMap.

-Alan.

[1] 
http://mail.openjdk.java.net/pipermail/jdk8-dev/2011-November/000302.html