Allow plugin_init_error to provide all information. Include final reset on specifications.

lib/vagrant/bundler.rb

@@ -63,15 +63,7 @@ module Vagrant
           @init_retried = true
           retry
         else
-          @logger.debug("#{failure.class}: #{failure}")
-          $stderr.puts "Vagrant failed to properly initialize due to an error while"
-          $stderr.puts "while attempting to load configured plugins. This can be caused"
-          $stderr.puts "by manually tampering with the 'plugins.json' file, or by a"
-          $stderr.puts "recent Vagrant upgrade. To fix this problem, please run:\n\n"
-          $stderr.puts "    vagrant plugin repair\n\n"
-          $stderr.puts "The error message is shown below:\n\n"
-          $stderr.puts failure.message
-          exit 1
+          raise
         end
       end
 
@@ -89,6 +81,8 @@ module Vagrant
       Gem.post_reset do
         Gem::Specification.all = full_vagrant_spec_list
       end
+
+      Gem::Specification.reset
     end
 
     # Removes any temporary files created by init

templates/locales/en.yml

@@ -983,10 +983,15 @@ en:
 
         %{conflicts}
       plugin_init_error: |-
-        The plugins failed to initialize correctly. If Vagrant was recently
-        updated, this error may be due to incompatible versions of dependencies.
-        To fix this problem please remove and re-install all plugins. Vagrant can
-        attempt to do this automatically by running:
+        The plugins failed to initialize correctly. This may be due to manual
+        modifications made within the Vagrant home directory. Vagrant can
+        attempt to automatically correct this issue by running:
+
+          vagrant plugin repair
+
+        If Vagrant was recently updated, this error may be due to incompatible
+        versions of dependencies. To fix this problem please remove and re-install
+        all plugins. Vagrant can attempt to do this automatically by running:
 
           vagrant plugin expunge --reinstall