fixes #14905 - enable DHCP orchestration with any boot mode

DHCP orchestration remains useful to set up PXE booting to start the
provisioning process, even when a static boot mode because the boot mode
is typically applied later through templates. It's also useful in image...

Fixes #13986 - don't use image unless in image provisioning method

(cherry picked from commit 4c512942c3921cf8be696ed12cc588b1716b29d7)

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

(cherry picked from commit 85c6f530855ffafbb90c02e1f9dadabe1b6823ac)

Fixes #13084 - compute resource IP orchestration fixed

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

Fixes #12911 - Turning on 0.35.1 cops

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...

refs #12147 - fixing dhcp test to work properly with rails 4

In rails 4, the #reload method doesn't reset instance variables on the
reloaded instance, so we fetch it again as a new item. That said, the
reload method does work correctly for associations, just to be...