RFR: 8149064: Convert TraceProtectionDomainVerification to Unified Logging

[Max Ockner]

Please review this conversion of TraceProtectionDomainverification to 
Unified Logging.

Theres some output that I think should be changed, but I want to see 
what others think first.

Bug: https://bugs.openjdk.java.net/browse/JDK-8149064
Webrev: http://cr.openjdk.java.net/~mockner/protectiondomain.02/

TraceProtectionDomainVerification is a non-product flag, but the output 
will now be available in product builds through 
-Xlog:protectiondomain=debug.
  - The output is concise. "-version" produces no output, and 
"Hello.java" produces 27 lines (if level=trace) or fewer. See below.
  - This change doesn't rely on "#ifndef PRODUCT" and is smaller than 
most logging changes that we've seen so far.
  - refworkload shows now significant performance changes.

Tested with jtreg hotspot tests and refworkload.

Here is sample output for a run of Hello.java:

[0.138s][debug][protectiondomain]  - class loader:      a 
'sun/misc/Launcher$AppClassLoader'
[0.138s][debug][protectiondomain]  - protection domain: a 
'java/security/ProtectionDomain'
[0.138s][debug][protectiondomain]  - loading: 'java/lang/Object'
[0.139s][debug][protectiondomain]  -> granted
[0.139s][debug][protectiondomain]
[0.139s][trace][protectiondomain] pd set = #1
[0.139s][debug][protectiondomain] Checking package access
[0.139s][debug][protectiondomain]  - class loader:      a 
'sun/misc/Launcher$AppClassLoader'
[0.139s][debug][protectiondomain]  - protection domain: a 
'java/security/ProtectionDomain'
[0.139s][debug][protectiondomain]  - loading: 'java/lang/String'
[0.139s][debug][protectiondomain]  -> granted
[0.139s][debug][protectiondomain]
[0.139s][trace][protectiondomain] pd set = #1
[0.139s][debug][protectiondomain] Checking package access
[0.139s][debug][protectiondomain]  - class loader:      a 
'sun/misc/Launcher$AppClassLoader'
[0.139s][debug][protectiondomain]  - protection domain: a 
'java/security/ProtectionDomain'
[0.139s][debug][protectiondomain]  - loading: 'java/lang/System'
[0.139s][debug][protectiondomain]  -> granted
[0.139s][debug][protectiondomain]
[0.139s][trace][protectiondomain] pd set = #1
[0.140s][debug][protectiondomain] Checking package access
[0.140s][debug][protectiondomain]  - class loader:      a 
'sun/misc/Launcher$AppClassLoader'
[0.140s][debug][protectiondomain]  - protection domain: a 
'java/security/ProtectionDomain'
[0.140s][debug][protectiondomain]  - loading: 'java/io/PrintStream'
[0.140s][debug][protectiondomain]  -> granted
[0.140s][debug][protectiondomain]
[0.140s][trace][protectiondomain] pd set = #1

I am anticipating several comments and suggestions, but I believe there 
are only minor changes remaining. I would like to remove the empty 
space, though I believe this was present in the 
TraceProtectionDomainVerification output to make the output more 
readable. I also anticipate that you may want me to remove the "-" from 
in front of some of the lines.  Again, I would like input since output 
seems like it was designed to look a certain way.

Thanks,
Max