Fix HV-VES readiness probe

Fix HV-VES readiness probe

In related commits from DCAEGEN2-1025 location of healthcheck script
was changed.

- changed log_directory property in blueprint - current
location of log directory is  `/var/log/ONAP/dcae-hv-ves-collector`
according to logging specification v1.2 [Casablanca]
- also to be more compatible with logging spec: added default logback
configuration filepath to allow mounting different configuration.
HV-VES will fallback to jar-defined configuration in case of not finding
it on filesystem
- used hv_ves_name property for dns_name as hardcoded value was same

Change-Id: I8877ca774109ef293f3daaf057d5bcf666fa5305
Issue-ID: DCAEGEN2-1025
Signed-off-by: Filip Krzywka <filip.krzywka@nokia.com>