Split functional test into standalone and utility class

Split functional test into standalone and utility class

This allows functional tests to be written for each individual template.
See the test_Wordpress_Single_Instance for an example, but the basic
form to follow is:

import util

def test_template():
    func_utils = util.FuncUtils()

    func_utils.create_stack(template, 'F17')
    func_utils.check_cfntools()
    func_utils.wait_for_provisioning()
    func_utils.check_user_data(template)

    ssh = func_utils.get_ssh_client()

    # test stuff here

    func_utils.cleanup()

Functional test changes:
Changed jeos creation to use new tool.
Added distribution to heat stack creation.
Improved IP parsing from glance.
Improve SSH connection exception handling.
Changed cfntools SHA check to match installed copy instead of locally.
Fixed stack parsing to check correct file and handle user-data injection.

Clean up run_tests a little to make it clear default execution is on host.
Add a short option for unit test running only (may be important due to not
wanting to run functional tests locally).

Also added paramiko to test-requires.

Change-Id: Ib2ae1be32801cb0ee3d1937c4f82ab9f574b4591
Signed-off-by: Jeff Peeler <jpeeler@redhat.com>