Merge pull request #33 from gfidente/master

Fix incorrect reference to nfs-utils element when it is named nfs-client
Add epel as requirement for RHEL7/RDO undercloud-source JSON
Remove instructions to pull patch for x86_64 to create-nodes

The needed patch has been merged, so we don't need to pull it in
manually anymore. Instead we update LKG to include it.
Merge pull request #36 from gfidente/x86_64

Remove instructions to pull patch for x86_64 to create-nodes
Add support for tripleo packages

If instack-undercloud is installed from package, other tripleo packages will be
used. If run from git, then other tripleo projects will also be used from
source.

The behavior can also be controlled via $INSTACK_TRIPLEO_SOURCE
Set INSTACK_ROOT for the packaged install
Make sure $NETWORK_JSON is defined.
Remove specfile and building instrcutions, the source is now maintained in dist-git exclusively
Remove unused tuskarcli scripts
Remove unused instack-install-undercloud
Rename instack-install-undercloud-packages to instack-install-undercloud
Remove unused fedora-20-undercloud-packages.json
Remove unused element keystone-1289935
Remove unused element horizon-test-build
Remove unused element tuskar-config
Remove unused element undercloud-post-config-package
Rename undercloud-post-config-source element to undercloud-post-config
In nova cpu_arch goes defined as x86_64
Remove unused element tripleo-incubator
Do tar install only as part of source install since a packaged install will do it automatically