fixes #2710 - removed a superfluous os name check that was tripping up safemode.
Fixes #2722 - Support for crossdomain auth

Newest Signo support authentication across more domains. We just need to
look not only to a cookie but parse parameters for getting username.
fixes #2724 - use __method__ instead of static method names in SSO
fixes #2645 - non-admin users can now create smart variables
Fixes #2712 - Handle Net::SSH::Disconnect gracefully
part of a fix to #2716 error in discovery plugin menu and user without provisioning permissions
the other part is a fix to the discovery plugin.
fixes #2728 - POST /api/hostgroups does not accept ancestry
fixes #2727 - fix oVirt test connection method definition
fixes #2713 - do not update nics table on every host update as a workaround to bug #2489
fixes #2707 - host save fails for non-admin if host has a BMC interface
Refs #969 - Foreman-side changes for serving templates from the proxy