Use assignment_regex, only_if and bump profile version

[alexpop]

To avoid inspec exec warnings like these:

192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709
192.168.56.40 [DEPRECATION] `:assignment_re` is deprecated in favor of `:assignment_regex` and will be removed in the next major version. See: https://github.com/chef/inspec/issues/1709

and check warning:

$ inspec check .
Location:    .
Profile:     linux-baseline
Controls:    51
Timestamp:   2017-05-30T13:07:59+01:00
Valid:       true

  !  ./controls/os_spec.rb:170: Control os-05b has no tests defined

Summary:     0 errors, 1 warnings

[chris-rock]

Thank you @alexpop