deb: Drop Ubuntu 12.04 support

The libvirt and Qemu versions (1.2.2 and 2.0) in Ubuntu 12.04 are
to old to support for CloudStack going forward.

Ubuntu 14.04 and 16.04 provide the support required to provide new
features and more stability.

Author: wido

debian/control

@@ -22,7 +22,7 @@ Description: CloudStack server library
 
 Package: cloudstack-agent
 Architecture: all
-Depends: ${misc:Depends}, ${python:Depends}, openjdk-8-jre-headless | openjdk-7-jre-headless, cloudstack-common (= ${source:Version}), lsb-base (>= 4.0), libcommons-daemon-java, openssh-client, qemu-kvm (>= 1.0), libvirt-bin (>= 0.9.8), uuid-runtime, iproute, ebtables, vlan, jsvc, ipset, python-libvirt, ethtool, iptables, lsb-release
+Depends: ${misc:Depends}, ${python:Depends}, openjdk-8-jre-headless | openjdk-7-jre-headless, cloudstack-common (= ${source:Version}), lsb-base (>= 4.0), libcommons-daemon-java, openssh-client, qemu-kvm (>= 2.0), libvirt-bin (>= 1.2.2), uuid-runtime, iproute, ebtables, vlan, jsvc, ipset, python-libvirt, ethtool, iptables, lsb-release
 Conflicts: cloud-agent, cloud-agent-libs, cloud-agent-deps, cloud-agent-scripts
 Description: CloudStack agent
  The CloudStack agent is in charge of managing shared computing resources in