Interrupting provisioning - Nailgun part

Change-Id: If8dd1baae4295fc046a169afdfec966fe5db28db
Prepare network_checker for ci

Vagrant will spawn virtualbox vm with 3 interfaces
with 2 of them in same network (which will be handy for some debug)

eth1 and eth2 will be controlled by dhcp server in same network

This approach has couple of requirements:
1. virtualbox installed on jenkins node
2. vagrant installed on jenkins node
3. added precise64 box for vagrant

vagrant up - will create vm and install all necessery packages

to run tests:
vagrant ssh -c 'sudo py.test /vagrant/'

will run tests for network_checker and dhcpchecker
exit status will be non-zero in case of errors
sudo is required for capturing data on ifaces

To make docker approach to work:
1. Share linux drivers for docker containter (netchecker uses modprobe 8021q)
2. setup dnsmasq on same bridge which this docker image is using

Tests can be started on local machine with help of vde switch:
py.test --vde ./
This will create vde_switch and tap ifaces (tap11, tap12)

Related to blueprint fuel-network-checks-ci
Change-Id: Ieefca56f31db988a610870710ec9cb0ad1a0d6a6
Grunt task to remove unnecessary static files after compression

As we removed deletion of unnecessary files from iso build script
due to errors, many users were confused as they were trying to
change static files on a master node and there was no effect as
require.js compiles concatenates all the files into main.js. So we
decided to revive this functionality as a part of 'grunt build'

Change-Id: I227616153effcd7ded0ad6617773f46359443b4e
Merge "Grunt task to remove unnecessary static files after compression"
Merge "Interrupting provisioning - Nailgun part"
Merge "Prepare network_checker for ci"
Repair broken nailgun test in master

merge 15e6a73 (today) caused by ed96aec9

Caused ERROR: test_stop_provisioning
 (nailgun.test.integration.test_stop_deployment.TestStopDeployment)

Due to differing changes between
 https://review.openstack.org/#/c/79562/
 https://review.openstack.org/#/c/81501/

Change-Id: I6c4b4d9d0383992e871b721e9d39f650fe17495a