housekeeping: Silently ignore check version if Scylla is not available
housekeeping: Silently ignore check version if Scylla is not available

Normally, the check version should start and stop with the scylla-server
service.

If it fails to find scylla server, there is no need to check the
version, nor to report it, so it can stop silently.

Signed-off-by: Amnon Heiman <ed5fc74c4692051ad0b19749fd7cea6ec2d74b9e@scylladb.com>

raphaelsc/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,duarten/scylla,raphaelsc/scylla,scylladb/scylla,duarten/scylla