Change heat templete

The old template tried to create new user but
the 'identity->username' does not have right to create another users.
The fix changes template so that it creates empty cloud init config
Pass networks to create_server method

The test_list_servers_filter_by_exist_host fails with
'Multiple possible networks found' error. There is a need
to set networks during creation of an instance because
the admin user has two predefined networks
There is no need to specify fixed_ip value
Add create_image method to ServersClientJSON class
Gitignore and use newest nova client for servers groups
Don't use swift if no swift
test allowed ipv6 subnets attributes combinations (slaac & dhcpv6)
Disable load balander test, bug 1342124
add list of ipv6 related tests to run from CI
Fix test names
Pass networks to create_server method

The test_list_servers_filter_by_exist_host fails with
'Multiple possible networks found' error. There is a need
to set networks during creation of an instance because
the admin user has two predefined networks
Upstream
test all possible ipv6 address assignment combinations for subnets
Merge pull request #8 from kshileev/ipv6

test all possible ipv6 address assignment combinations for subnets
adopt ip_version settings for scenario tests
Merge pull request #9 from kshileev/ipv6

adopt ip_version settings for scenario tests
Merge branch 'master-in-use' of https://github.com/CiscoSystems/tempest into master-in-use
Allows choosing ip_version for ScenarioTest based tests  Eliminates hard-code which makes all ScenarioTest based tests creating default IPv4 subnet. Implements possibility to switch the test from ip_version=4 (still the default) to ip_version=6
Cherry picked from upstream under review: Change-Id: I728edf0165ba47b6f8930f2fb3d08bd29cfbb317

Change-Id: Idc9a52eb5b8f5284b0729737c86fdf856c6a6189
Merge pull request #11 from kshileev/ipv6

new way to configure ipv6 scenario test