Refactor the code, moving the hostpath helper functionality to new
"pkg/utils/hostpath" package. This breaks odd-ish dependency
"pkg/utils" -> "source".
The methods are used during calculation of reserved memory for system workloads.
The calcualation is `resourceCapacity - resourceAllocatable`.
Signed-off-by: Artyom Lukianov <alukiano@redhat.com>
