Introduce new Resource BMCSettings and Controller and support DELL BMC settings

[nagadeesh-nagaraja]

Summary

Create the basic Resource BMCSettings and implement Controller logic. Add support for DELL systems

Basic example

#287

Motivation

Initial diff for the resource.

[nagadeesh-nagaraja]

add crd BMCSettings with mapping 1:1 to BMC crd
add controller (BMCSettings Reconciler) to handle updating BMC settings
update bmc package. to enhance ability to handle bmc for DELL systems.

The controller workflow is as follow:

bmc setting update is handled in in handleSettingInProgressState func.
this state is reached with or without BMC version upgrade, ie as long as BMC (idrac, ilo, etc) version matches.
get the current BMC setting, check the diff with the required setting and apply it
creates a maintenance task for all related servers ( managed by the BMC in question).
waits for all maintenance to be granted, before processing
apply the settings. reboot BMC if needed.
verify the settings are applied before moving the state to completed.