Fixes #5859 - don't rely on a mac address being present when overriding the conflicts

We tried to initiate the `dhcp_record` for checking if conflicts were
there. The problem was the mac address was not available at that stage
when using the compute resources. It also turns out there is no need...

Fixes #14113 - run dhcp orchestration only on DHCP subnets

Fixes #13084 - compute resource IP orchestration fixed

Refs #12911 - Fixing colon method calls

fixes #13297 - ssh_provision: try keyboard-interactive as well

With password auth try keyboard-interactive as well since (non PAM
based) password authentication might be disabled in sshd_config (as e.g.
on SLES12).

Fixes #12946 - Do not fail miserably when compute instance is not found.

fixes #12517 - VMWare VM should be created network based only if it is selected in the gui

fixes #12345 - fix sparc host creation

Fixes #11987 - Check exit code of deployment scripts

This commit fixes checking exit codes returned from provisioning templates, which were ignored
because of sending results through pipe to command tee. Also adds optional host deleting if deployment
fails because of non zero exit code. This can be configured by setting clean_up_failed_deployment...

Fixes #12067 - Delegated methods need to be public, not protected

generate_pxe_template and require_ip_validation? are delegated to
primary interface on Host::Managed. However, these methods are
protected. On Rails 4, protected methods cannot be called through a...