fixes #1509 - Foreman should use the proxy to import puppet classes

fixes #1324 - Separate permssions on hosts from permissions for objects within hosts.

This allows a user to be granted permission to edit the host (and so change the group or proxy) but not, for example, edit the parameters
This could probably be extended further if necessary.

fixed issues with newer version of virt, reusing the newer gem

fixes #1476 - toggling between bare metal to an hypervisor renders js errors

fixes #1451 - Host creation fails if ":tftp_servername:" is set in proxy-settings

fixes #1446 - expire idle web sessions

fixes #786 - Add the option to use existing DHCP reservations

note that this patch only ensures that the ip used is the same as the
existing dhcp record.
if there is a mistmatch in what foreman expects in the reservation vs.
actual state, #944 should kick in.

fixes #1422 - Media is greyed out when creating Solaris hosts

fixes #1421 - expose subnet ranges for automatic IP address allocations

Fixes #1420 - bootserver ip lookup fails when not managing DNS

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>