RFR 8054474: Add --state-dir=bar to sjavac

[Fredrik Öhrström]

Currently sjavac defaults to store the sjavac_state file in the destination
dir along the generated classes,
this can be inconvenient in some build systems, because you have to avoid
the state file when creating a jar archive. It is convenient to be able to
relocate javac_state to a state dir. This directory will also hold a
default portfile javac_server and the log files for the server, if the
server conf is not supplied.

The state dir defaults to the destination dir.

http://cr.openjdk.java.net/~ohrstrom/webrev-8054474-statedir/

https://bugs.openjdk.java.net/browse/JDK-8054474

//Fredrik
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