fixes #5248 - restrict fog-core to compatible version (fog#2873)

(cherry picked from commit a253106b8c0dc46ce49188d968edc745a0bc4a68)

fixes #4555 add ca certificate to ovirt

fixes #4123 - libvirt imaging support using backing volumes

Fixes #3945: pin fog to 1.19.x to fix VMware provisioning bug

fixes #3717 - pin fog to 1.18.x

fixes #3626 - add unf to the bundler configuration for proper encoding for fog

Fixes #2540: bump fog version to 1.15.0

switch to latest released fog

fixes #2163 New host installation fails with RHEV 3.1

updated fog version, as a few vmware related bugs where fixed

fog 1.8 has been released - updating gem file

fixes #1589 provisioning vmware support

update to latest released version of fog

fixes #1702 Use https instead of git for fog gem checkout

make bundler a bit more packaging friendly.