Adding ucarp ebuild which includes an init script

Further enhancements:
- bumping EAPI of the ebuild from 4 to 5
- adding default VIP up/down scripts with a parametrized prefix length
Pull updated ebuild from Gentoo but with a block for libcacard (file collision and only required for the spicec client).
Switch to Gentoo 13.0/no-multilib as parent profile since 10.0 is deprecated.
Disable smartcard USE flag for spice since only required for the spicec client.
Remove block for gcc-4.6 since we want latest before shipping.
Mask zabbix-2* for now.
Unmask qemu-kvm 1.4
Bump version of foss-cloud-bin ebuild to 3.7.8
Bump version of vm-manager ebuild to 1.2.8.
Bump version of fc-configuration ebuild to 1.2.6, /etc/portage/make.conf should use rather than build binary packages.
Version bump for node-integration scripts v1.2.7
Version bump for FOSS-Cloud 1.2.0_rc13