ICSHWI-8931: Restart IOC if internal metadata changed
Other needed changes:
- fix for test IOCs to require
essioc
and loadcommon_config.iocsh
so their PIDs can be obtained - added dedicated IOC to test nonvolatile systemd service file mount requirement;
CCCE:test-nfs
was used to test all sorts of things and it did not seem right to restart it as part of the mount test and not be able to later check that it was restarted only because of the mount test