Add puppet-apply-dev and wrap with govuk_puppet

This commit moves the incantations for running puppet in the dev VM into
`tools/puppet-apply-dev`, and makes `govuk_puppet` just a wrapper for this
script in the dev environment.

This also simplifies changes to this `puppet-apply-dev` because the version of
`govuk_puppet` that comes preinstalled on the Vagrant basebox can also be a
wrapper around this file, meaning that changes less frequently require
rebuilding the basebox.

modules/puppet/files/govuk_puppet_development

@@ -1,6 +1,2 @@
 #!/bin/sh
-cd /var/govuk/puppet
-
-# Filter warnings about 'storeconfigs' not being set -- we don't currently
-# attempt to test stored config configuration on the dev vm
-exec sudo RUBYOPT="-W0" puppet apply manifests/site.pp "$@" | egrep -v "warning:.+storeconfigs"
+exec sh /var/govuk/puppet/tools/puppet-apply-dev "$@"

tools/puppet-apply-dev

@@ -0,0 +1,9 @@
+#!/bin/sh
+cd "$(dirname "$0")"
+cd ..
+
+bundle install --quiet
+
+# Filter warnings about 'storeconfigs' not being set -- we don't currently
+# attempt to test stored config configuration on the dev vm
+exec sudo RUBYOPT="-W0" puppet apply manifests/site.pp "$@" | egrep -v "warning:.+storeconfigs"