Update glusterfs to 3.4.0. Here are the changes since 3.3.x

* Improvements for Virtual Machine Image Storage
A number of improvements have been performed to let Gluster volumes provide
storage for Virtual Machine Images. Some of them include:
  - qemu / libgfapi integration.
  - Causal ordering in write-behind translator.
  - Tunables for a gluster volume in group-virt.example.

The above results in significant improvements in performance for VM image
hosting.


* Synchronous Replication Improvements
GlusterFS 3.4 features significant improvements in performance for
the replication (AFR) translator. This is in addition to bug fixes
for volumes that used replica 3.


* Open Cluster Framework compliant Resource Agents
Resource Agents (RA) plug glusterd into Open Cluster Framework
(OCF) compliant cluster resource managers, like Pacemaker.

The glusterd RA manages the glusterd daemon like any upstart or
systemd job would, except that Pacemaker can do it in a cluster-aware
fashion.

The volume RA starts a volume and monitors individual brick?s
daemons in a cluster aware fashion, recovering bricks when their
processes fail.


* POSIX ACL support over NFSv3
setfacl and getfacl commands now can be used on a nfs mount that
exports a gluster volume to set or read posix ACLs.


* 3.3.x compatibility
The new op-version infrastructure provides compatibility with 3.3.x
release of GlusterFS. 3.3.x clients can talk to 3.4.x servers and
the vice-versa is also possible.

If a volume option that corresponds to 3.4 is enabled, then 3.3
clients cannot mount the volume.

* Packaging changes
New RPMs for libgfapi and OCF RA are present with 3.4.0.


* Experimental Features
  - RDMA-connection manager (RDMA-CM)
  - New Block Device translator
  - Support for NUFA

As experimental features, we don?t expect them to work perfectly
for this release, but you can expect them to improve dramatically
as we make successive 3.4.x releases.


* Minor Improvements:
  - The Ext4 file system change which affected readdir workloads for
    Gluster volumes has been addressed.
  - More options for selecting read-child with afr available now.
  - Custom layouts possible with distribute translator.
  - No 32-aux-gid limit
  - SSL support for socket connections.
  - Known issues with replica count greater than 2 addressed.
  - quick-read and md-cache translators have been refactored.
  - open-behind translator introduced.
  - Ability to avoid glusterfs bind to reserved ports.
  - statedumps are now created in /var/run/gluster instead of /tmp by default.

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