Feature 10955: Osmclient changes related to VIM configuration with a Prometheus TSDB system

This commit should be merged AFTER the revert in the commit https://osm.etsi.org/gerrit/#/c/osm/osmclient/+/12725/



Change-Id: Ifae76a63f6fecf323e63d38daa06196a4ba33345
Signed-off-by: Luis Vega <lvega@whitestack.com>