Ubuntu and Debian boostraps can now install apache-libcloud. Refs #278.
Fedora is now able to install apache-libcloud. Refs #278
`yum-utils` is now part of all Fedora installs
RedHat based distributions can now install apache libcloud. Refs #278.
Use a common variable for the libcloud minimal version
Amazon AMI's are now able to install apache-libcloud. Refs #278.
Arch can now install libcloud. Refs #278.

And also upgrades if required.
Allow upgrading SuSE based distributions
openSUSE can now install apache-libcloud
SuSE can now be upgradable
SuSE is now also able to install apache-libcloud. Refs #278.
Gentoo is now able to install apache-libcloud. Refs #278.
Update changes log
Merge pull request #309 from s0undt3ch/features/cloud-support

Add libcloud support