RFR (xs) 8059588: deadlock in java/io/PrintStream when verbose javax.net.debug flags are set

[Seán Coffey]

This issue was reported while debugging a pkcs11 issue. While I can't 
reproduce it, the captured stack trace does show a deadlock issue. Fix 
is to simply stop using the SessionManager class lock to record and 
print the maxActiveSessions in use and replace it with a local lock.

bug: https://bugs.openjdk.java.net/browse/JDK-8059588
webrev : http://cr.openjdk.java.net/~coffeys/webrev.8059588/webrev/
Regards,
Sean.