This partially fixes operator-framework#1707. The intent is to consolidate internal code
from operator-controller and catalogd within internal e.g.:

catalogd/ - code specific to catalogd
internal/ - holds internal code of catalogd and operator-controller.
internal/catalogd - holds unexported code specific to catalogd
internal/operator-controller - holds unexported code specific to operator-comntroller
internal/shared - shared code between catalogd and operator-controller which can not be exported outside.

Signed-off-by: Lalatendu Mohanty <lmohanty@redhat.com>