Added a control file required to build the securedrop-grsec meta package.

removed the ossec and securedrop app portions from the build script since they are different now.

```
vagrant up mon-build --no-provision
sudo su
cd /vagrant/
./build_deb_packages.sh
```

dpkg does not resolve dependencies so testing is a 3 part process:

```
dpkg -i /tmp/build/securedrop-grsec-0.3-amd64.deb
apt-get -fy install
dpkg -i /tmp/build/securedrop-grsec-0.3-amd64.deb
```

There are other tools that you can install and use that do handle package dependencies for local deb packages.