Add a unique key to the devshop environment table (#437)

* Add a unique key to the devshop environment table so that the same name/project_nid combo cannot be added twice.

* Add ./devmaster volume mount to testing docker-compose file as well.

* Revert "Add ./devmaster volume mount to testing docker-compose file as well."

This reverts commit 5f2e8d6.

* Use a key name that differs from the index name.

* Change unique key to project_nid_name.

* Drop the old index in the project_environment table before adding a new
unique key.

* Add "Run DevShop Server Upgrade Tests".

* merge fix

* Put php_version and php_default_version_debian variables to 7.1.

* Add "php_version" variable to devshop.users role so it is loaded in time for geerlingguy.php to read it.

devmaster/modules/devshop/devshop_projects/devshop_projects.install

@@ -30,7 +30,7 @@ function devshop_projects_update_dependencies() {
  */
 function devshop_projects_install() {
 
-  // Push devshop_projects's system weight to 1.
+  // Push devshop_projects system weight to 1.
   db_update('system')
     ->fields(array(
       'weight' => 1
@@ -131,8 +131,11 @@ function devshop_projects_schema() {
         'description' => 'The NID of the last task that should be displayed on an environment.',
       ),
     ),
-    'indexes' => array(
-      'project_environment' => array('project_nid', 'name'),
+    'unique keys' => array(
+      'project_nid_name' => array(
+        'project_nid',
+        'name',
+      ),
     ),
   );
   return $schema;
@@ -475,4 +478,13 @@ function devshop_projects_update_7009 () {
   if (!db_query($query)) {
     drupal_set_message(t('Something went wrong when running a query to update hosting_context table to ensure all projects are prefixed with "project_":') . $query);
   }
-}
+}
+
+/**
+ *  Add the "project_environment" unique index to the hosting_devshop_project_environment table.
+ */
+function devshop_projects_update_7010() {
+  db_query("ALTER TABLE {hosting_devshop_project_environment} DROP INDEX project_environment");
+  db_query("CREATE UNIQUE INDEX project_nid_name ON {hosting_devshop_project_environment}(project_nid, name)")
+    ->execute();
+}