commands/reload: if --provision is present, force provision [GH-3657]

CHANGELOG.md

@@ -9,6 +9,7 @@ BUG FIXES:
   - core: Global control works from directories that don't have a
       Vagrantfile.
   - commands/package: `--base` works without crashing for VirtualBox.
+  - commands/reload: If `--provision` is specified, force provisioning. [GH-3657]
   - guests/redhat: Fix networking issues with CentOS. [GH-3649]
   - providers/docker: Show proper error message when on Linux. [GH-3654]
   - synced\_folders/rsync: Create the directory before syncing.

plugins/commands/up/start_mixins.rb

@@ -13,6 +13,7 @@ module VagrantPlugins
         # Add the options
         parser.on("--[no-]provision", "Enable or disable provisioning") do |p|
           options[:provision_enabled] = p
+          options[:provision_ignore_sentinel] = true
         end
 
         parser.on("--provision-with x,y,z", Array,