fix change_host_name for Ubuntu Hardy
Fix match? and nfs? for Arch host
Use a better check for systemd

Using `which systemctl` would return true on even non-systemd machines
during this transitional time.
Fix old channel usage on chef client provisioner
Omit empty lines in Puppet provisioner output

The sudo() block and/or the Puppet provisioner often returns newline
characters as separate strings. This makes the chomp() ineffective and
results in extraneous spacing between the output lines.

Separate out the call to chomp() so that we only do it once. Then only
output info if that line is not an empty string.
Merge pull request #1213 from dcarley/puppet_newline_output

Omit empty lines in Puppet provisioner output
Merge pull request #1209 from pbrisbin/arch-fix-3

Additional Arch host class fixes
Merge pull request #1191 from lorello/master

Fix change_host_name on Ubuntu Hardy
Remove the buildbot stuff, we'll move away from it.
Remove plugin activation. It really isn't necessary.

It was only used in a couple places and it isn't necessary since you can
do the loading within the actual blocks themselves.
Don't allow registry to be given value in non-block form
Much cleaner plugin part querying syntax.

Before we were manually going over every plugin and getting each piece,
all over the place. Now we have a central manager that will give us all
the pieces we want. There is still some cleanup to do here but this is
much better overall.
Additional tests for the plugin manager.
Add support for "upgrade safe" config classes to plugins.

These are classes that use NO core classes of Vagrant, and are therefore
safe to load for upgrades. i.e. a V2 core can load a V1 config class
that is deemed upgrade safe without crashing Vagrant.
Mark core config classes as upgrade safe
V1 config loader loads upgradable config if not V1

This is to prepare for the upcoming V2 configuration. When we're in V2,
we only want to load _upgradable_ configuration keys.
Clean up tests a bit more
Build the v2 interface, which is just a copy of V1 for now.
Convert comands to V2 plugins.
Get rid of some ruby warnings due to shadowed variables