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
add PyCharm config files to .gitignore
test all allowed ipv6 ra,address combinations for neutron subnet-create --ip-version 6
Merge branch 'ipv6' of https://github.com/kshileev/tempest into ipv6