Seems that there was a fix into physnet implementaion but spec was not adjusted for this:
RUN: bundle exec rspec --format documentation --color --tty --backtrace --exclude-pattern 'spec/hosts/globals/globals_spec.rb' --pattern 'spec/hosts/**/*_spec.rb'
/home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/hosts/openstack-network/plugins/ml2_spec.rb:65:in `block (3 levels) in <top (required)>': undefined method `[]' for nil:NilClass (NoMethodError)
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `module_exec'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `subclass'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:255:in `block in define_example_group_method'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/hosts/openstack-network/plugins/ml2_spec.rb:34:in `block (2 levels) in <top (required)>'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:374:in `module_exec'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:374:in `block in find_and_eval_shared'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:740:in `with_frame'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:373:in `find_and_eval_shared'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:341:in `include_examples'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/shared-examples.rb:60:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:374:in `module_exec'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:374:in `block in find_and_eval_shared'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:740:in `with_frame'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:373:in `find_and_eval_shared'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:341:in `include_examples'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/shared-examples.rb:126:in `block in run_test'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `module_exec'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `subclass'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:255:in `block in define_example_group_method'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/shared-examples.rb:116:in `run_test'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/shared-examples.rb:76:in `test_ubuntu_and_centos'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/hosts/openstack-network/plugins/ml2_spec.rb:190:in `block in <top (required)>'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `module_exec'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:385:in `subclass'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/example_group.rb:255:in `block in define_example_group_method'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/dsl.rb:43:in `block in expose_example_group_alias'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/dsl.rb:82:in `block (2 levels) in expose_example_group_alias_globally'
from /home/jenkins/workspace/fuellib_noop_tests/tests/noop/spec/hosts/openstack-network/plugins/ml2_spec.rb:5:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/configuration.rb:1361:in `load'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/configuration.rb:1361:in `block in load_spec_files'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/configuration.rb:1359:in `each'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/configuration.rb:1359:in `load_spec_files'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/runner.rb:102:in `setup'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/runner.rb:88:in `run'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/runner.rb:73:in `run'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/lib/rspec/core/runner.rb:41:in `invoke'
from /usr/local/rvm/gems/ruby-2.1.2/gems/rspec-core-3.4.1/exe/rspec:4:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.1.2/bin/rspec:23:in `load'
from /usr/local/rvm/gems/ruby-2.1.2/bin/rspec:23:in `<main>'
from /home/jenkins/workspace/fuellib_noop_tests/.bundled_gems/bin/ruby_executable_hooks:15:in `eval'
from /home/jenkins/workspace/fuellib_noop_tests/.bundled_gems/bin/ruby_executable_hooks:15:in `<main>'
Problem got from https://ci.fuel-infra.org/job/fuellib_noop_tests/7120/consoleFull
I found root cause - in job I provided is new fixtures which was created from old ones. As tested fix is long-lived, new code was merged into master with new fixtures provided. As long as copied ones weren't changed, noop tests was broken.