Netty Direct Buffer warning fix

When deploying Wildfly 8.x, you'll see this in the server.log:
```
INFO [io.netty.util.internal.PlatformDependent] Your platform does not provide complete low-level API for accessing direct buffers reliably. Unless explicitly requested, heap buffer will always be preferred to av
oid potential system unstability.
```
Following this into netty, here:
https://github.com/netty/netty/blob/master/common/src/main/java/io/netty/util/internal/PlatformDependent.java#L581
Down to here:
https://github.com/netty/netty/blob/netty-4.0.15.Final/common/src/main/java/io/netty/util/internal/PlatformDependent0.java#L82

We need access to sun.misc to see if direct buffers are available.
Update module.xml

Added javassist after inspecting io.netty log messages as "FINE" level after Wildfly startup and seeing additional information from netty requesting javassist for performance.
Update module.xml

Add optional flag to javassist as this is part of Wildfly-core
WFLY-3443 JCA tracking should default to false for datasources
[WFLY-3898] Speed up LDAP tests - use InMemory partitions for the ApacheDS
WFLY-3876 Porting to IJ 1.2.B4
WFLY-3801 Make sure NOT_SUPPORTED and REQUIRES_NEW are the only allowed SFSB lifecycle interceptor transaction attributes
Merge pull request #6782 from ctomc/build

Fix build on IBM JDK
WFLY-3937 removed private API property for org.codehaus.jackson.* modules
Update to 2.0.3.Final of remote naming (fixes WFLY-1149)
WFLY-3944 Broken integration between messaging subsystem and jgroups subsystem
Wildfly Core 1.0.0.Alpha9
Add session manager stats
Ignore SarTestCase as it now fails under a security manager
Merge pull request #6789 from stuartwdouglas/wfcore

Wildfly Core 1.0.0.Alpha9
WFLY-3951 Add dependency on java.transaction.api to weld-spi
Merge pull request #6787 from pferraro/clustering

WFLY-3944 Broken integration between messaging subsystem and jgroups subsystem
Merge pull request #6786 from n1hility/master

Update to 2.0.3.Final of remote naming (fixes WFLY-1149)
Merge pull request #6785 from mareknovotny/WFLY-3937

WFLY-3937 removed private API property for org.codehaus.jackson.* modules
WFLY-918 Add connector level statistics

Note that due to an Undertow bug bytes sent/received does not
display correctly at the moment, this will be fixed in the
next version of Undertow.