Remove unneeded sections from magstock band checklist

[cybersenshi]

[binary1230]

quick notes for @kitsuta: the files you need to modify are:

• plugin_bands.pp
• event-magstock.yaml
• band-development.ini.erb

I -believe- all you need to do is follow the example of the existing stage_agreement_deadline parameter in those files. It's a bit of slightly tedious copy+paste but should be pretty easy.

to re-deploy puppet locally to test:

vagrant ssh
cd ~/uber/puppet
./apply_node.sh localhost

[binary1230]

also when editing band-development.ini.erb, just be careful of the section header ordering like [dates]

other than that, same drill as usual.