test-kitchen: provision Cinc Client instead of Chef Infra Client

Set `product_name: cinc` on the dokken provisioner so kitchen-dokken
uses cincproject/cinc and skips the Chef license prompt, and pin
chef_version where it was missing.

site-cookbooks/kosmos-ejabberd/kitchen.yml

@@ -14,6 +14,7 @@ transport:
 
 provisioner:
   name: dokken
+  product_name: cinc
   client_rb:
     # the ejabberd package starts its service as ejabberd@localhost during
     # installation; keep the chef node name in sync so ERLANG_NODE matches

site-cookbooks/kosmos_email/kitchen.yml

@@ -25,10 +25,8 @@ provisioner:
   #   always_update_cookbooks: <%= !ENV['CI'] %>
   # always_update_cookbooks: false
 
-  ## product_name and product_version specifies a specific Chef product and version to install.
-  ## see the Chef documentation for more details: https://docs.chef.io/workstation/config_yml_kitchen/
-  #  product_name: chef
-  #  product_version: 16
+  # install Cinc Client instead of the license-gated Chef Infra Client
+  product_name: cinc
 
 verifier:
   name: inspec

site-cookbooks/kosmos_garage/kitchen.yml

@@ -1,6 +1,7 @@
 ---
 driver:
   name: dokken
+  chef_version: 18.2.7
   pull_platform_image: false
   pull_chef_image: false
   memory_limit: 2147483648 # 2GB
@@ -10,6 +11,7 @@ transport:
 
 provisioner:
   name: dokken
+  product_name: cinc
   clean_dokken_sandbox: false
   client_rb:
     environment: testing

site-cookbooks/kosmos_liquor-cabinet/kitchen.yml

@@ -1,10 +1,12 @@
 ---
 driver:
   name: dokken
+  chef_version: 18.2.7
   privileged: true  # allows systemd services to start
 
 provisioner:
   name: dokken
+  product_name: cinc
 
 transport:
   name: dokken

site-cookbooks/kosmos_rsk/kitchen.yml

@@ -25,10 +25,8 @@ provisioner:
   #   always_update_cookbooks: <%= !ENV['CI'] %>
   # always_update_cookbooks: false
 
-  ## product_name and product_version specifies a specific Chef product and version to install.
-  ## see the Chef documentation for more details: https://docs.chef.io/workstation/config_yml_kitchen/
-  #  product_name: chef
-  #  product_version: 16
+  # install Cinc Client instead of the license-gated Chef Infra Client
+  product_name: cinc
 
 verifier:
   name: inspec

site-cookbooks/liquor_cabinet/kitchen.yml

@@ -1,10 +1,12 @@
 ---
 driver:
   name: dokken
+  chef_version: 18.2.7
   privileged: true  # allows systemd services to start
 
 provisioner:
   name: dokken
+  product_name: cinc
 
 transport:
   name: dokken