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
Add session manager stats
WFLY-3951 Add dependency on java.transaction.api to weld-spi
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.
Merge pull request #6790 from jharting/WFLY-3951

WFLY-3951 Add dependency on java.transaction.api to weld-spi
Merge pull request #6758 from kwart/jbqa-10729-sec-realm-ldap-cache-wfly
Merge pull request #6745 from maeste/WFLY-3876
Merge pull request #6686 from innerverse/patch-1
WFLY-3957 Non-distributable session manager ignores max-active-sessions from jboss-web.xml
WFLY-3959: Upgrade HAL to 2.4.3.Final
[WFLY-3912] IronJacamar 1.2.0.CR1
Merge pull request #6794 from hpehl/WFLY-3959

WFLY-3959: Upgrade HAL to 2.4.3.Final
Remove picketbox-infinispan from /pom.xml
WFLY-3292: reworking deployment logic with respect to all EE Resource Definitions