cmake: exclude "grafonnet-lib" target from "all"

cmake: exclude "grafonnet-lib" target from "all"

so we don't build this target when running "make", and hence avoid
accessing the internet in a building envronment where the internest
access is not allowed.

Signed-off-by: Kefu Chai <kchai@redhat.com>
(cherry picked from commit 1835fd86ddfe7f00e9ec3124fa1425e53cd7a930)

Conflicts:
	monitoring/grafana/dashboards/CMakeLists.txt
- pacific does not have "LOG_DOWNLOAD ON", "LOG_MERGED_STDOUTERR ON", or
  "LOG_OUTPUT_ON_FAILURE ON", but that fact is orthogonal to the substance of
  this backport