Fixes #13245 - Remove duplicate apipie description from compute_resources

Fixes #12949 - Allow selection of external networks as main network in Openstack

fixes #13574 - remove DB access from Setting class scope

Plugins tend to register an initialiser before config/initializers/ to
require their own Setting subclasses. This loads them before
config/initializers/foreman.rb, which calls load_defaults on each known...

fixes #13077 - setting width of number of days by what is needed

fixes #13083 - error pages alert box is no longer dismissable

fixes #12920 - allowing os parameters to be set via API

fixes #11346 - on new host, nic shouldn't try to call matcher

there's no point in doing the call anyway (can, theoretically, use the
fqdn field instead of asking the host) because there shouldn't be any
lookup keys with that host's fqdn, as it's a new host....

Fixes #13444 - Don't show empty properties

Refs #12911 - Fixing colon method calls

fixes #13430 - add missing actions to virt power manager

When rebooting a vm via power manager, this fails:

| TypeError: nil is not a symbol | /Users/f0218175/foremandev/foreman/app/services/power_manager/virt.rb:25:in
`block (2 levels) in <class:Virt>'...